Crying is the Sunnah of the Prophets (peace be upon all of them)

The real requirement is that on suitable circumstances, mourning should be performed as practiced by the Prophets, as we read in Tafseer Kabeer, volume 1 page 285

“All the Prophets, Adam (as), Nuh (as) and Daud (as) mourned and cried over their hardships, and their acts weren’t invalid”

Similarly, we read in Sunan Ibn Majah, volume 2 page 285:

عن سعد بن أبي وقاص قال قال رسول الله صلى الله عليه و سلم : ( ببكوا فإن لم تبكوا فتباكوا )

Sa’ad bin Abi Waqas has reported from Holy Prophet (s) that he said: “Cry and if u can’t cry then make a crying face.”

Therefore criticizing our mourning and lamenting means criticism of the Sunnah of the apostles.

Crying particularly for the tragedies befallen the Ahlulbayt (as) is Sunnah of Holy Prophet (s)

We read in Sunan Ib Maja, Volume 1 page 517:

Narrated by Alqamah from Abdullah bin Masood:
One day we were sitting with Holy Prophet (s) while some children from the house of Bani Hashim came there. When the Holy Prophet (s) saw them, tears welled up in his eyes and he became pale.

Ibn Masood said that he told the Holy Prophet (s) “Your face reflects anxiety”. The Holy Prophet (s) stated: “Exalted God has granted us, the Ahlulbait, Hereafter instead of worldly pleasure.

After me, soon my Ahlubait will face calamity, hardship and misery till people having black flags will rise from East and seek justice, which will be denied them. They will wage war, they will be supported and will be given what they were demanding. They will not accept until it is handed over to one from our Ahlulbait (i.e. Mahdi) .He will fill the earth with justice as it was filled with unjustice. Whoever amongst you is alive at that period,should try to reach them even if he has to tread on ice in that pursuit.”

Safiya (r), Sayyida Fatima (as) and Rasulullah (s) cried over the slain body of Hamza (as)

In Madarij al-Nubuwath, volume 2, page 152 Shaykh Muhammad Abdul Haq Mohaddith Dehalvi writes:

” Safiya came and stood by the head of Hamza’s (r.a) body and she along with Fatima (s.a) kept crying for him and due their mourning, Holy Prophet (s) also started crying.”

Holy Prophet (s) wept over the martyrdom of Jaffar ibn Abi Talib (as)

The beloved scholar of wahabis Ibn Katheer writes in his authority work al Bidayah wa al Nihaya, Volume 4, page 673, published by Nafees Academy Karachi:

Ibn Ishaq narrates that on the day when Jafar ibn Abi Talib was martyred in Ghazwa Moutah; Holy Prophet (s) called upon Abdullah bin Jafar and made him sit on his lap and started kissing his forehead and eyes, while tears were flowing from his own Holy eyes.

The Sahaba inquired: “O Prophet of Allah! Is it so that some grieving news has come about Jafar that has made your tears flow?”

The Holy Prophet (s) replied: “Yes, Today Jafar has been martyred there, but the troubles and the plight that he went through before being martyred is very grieving.”
al Bidayah wa al Nihaya, Volume 4, page 673

Nawasib such as the people of Sipah-e-Sahaba [kr-hcy.com] often advance a notion namely the martyrdom of the people who have laid their lives in the way of Allah(swt) should be celebrated and not mourned due to the fact that they are victorious and mourning their deaths is a sign of showing doubts in their victorious end. The people who uphold such pathetic beliefs and mock Shias should see the above cited episode carefully and tell us wasn’t Prophet(s) sure about the best place that Jaffar (as) had attained after his martyrdom ? Holy Prophet(s) not only wept for the martyrdom of Jaffar Ibn Abi Talib (as) but also gave best relpy for any such pathetic comment i.e Prophet(s) was distressed over the tragedies befallen on Jaffar (as) before his martyrdom. The Shias likewise mourn for the cut-throat calamities that sturck Imam Hussain (as) and his companions before attaining the status of martyrs.

Sahaba along with Holy Prophet(s) wept over the martyrdom of Hamza (ra)

Shiekh Abdul Haq Dehalvi writes that companions including Abu Bakar wept over the miserable death of Hamza (ra) along with Holy Prophet(s):

“It is narrated that when the tragedy stricken people were standing in the way to welcome the Holy Prophet (s) back, Fatima, the daughter of Hamza(ra) was standing by the roadside and watching the army of Prophet (s) coming in numbers, Fatima was trying to find her father amongst them but she didn’t see him. Then she went to Abu Bakr and inquired: “Where is my father, I don’t see him in the army.” Abu Bakr’s eyes filled with tears and with a heavy heart he replied: “The Prophet of Allah must be coming soon.” When Holy Prophet (s) arrived, and she didn’t see her father even with the Prophet (s), she held the rope of Prophet’s carriage [horse/camel] and said: “O Prophet of Allah! Where is my father?” Prophet (s) replied: “I am your father.” She said: “O Prophet of Allah! I smell blood from this speech.” And tears started to flow from her eyes, with this tears leaked out of the eyes of the other companions too. She then said: “O Prophet of Allah! Narrate the condition of my father’s martyrdom.” Holy Prophet (s) replied: “My daughter! If I narrate the state of his martyrdom, you will not be able to control yourself.” Hearing this Fatima (Hamza’s (ra) daughter) screamed out.”
Madarij un Nabuwat, Volume 2, page 230 published in Karachi

If weeping over the dead is Haram than what do Nawasib think about companions and Holy Prophet (s) who were so aggrived and wept over Hamza’s martyrdom ?