It is fair to judge a religion on its fruits. For all the flowery language of the Faith regarding peace and unity, at no time have its leading figures reconciled opposing parties and built a stable community. In fact, rancor and violence have marked the Faith's history, and no transition of leadership has been accomplished through amity and agreement.

On a recent visit to Haifa I (Henry Harris Jessup) called on Abbas Effendi and had a half-hour's conversation with him. My companion was Chaplain Wells, of Tennessee, recently from the Philippines, who had met at Port Said an American lady on her way to Haifa to visit Abbas Effendi. We met her at the hotel and had a four hours' conversation with her. She seemed fascinated or hypnotized by the Effendi. She had been converted four years ago under Mr. Moody's preaching in New York, attended the Brick Church for a time, and in some way heard of Abbas Effendi as being an eminently holy man.

In July of 1850 the Bab was executed by the Iranian government. Thereafter a number of important Babis put forth extravagant claims, including, in 1851, Sayyid Basir-i Hindi of Multan. Bahá'u'lláh challenged Sayyid Basir, and asserted his own divinity instead (many Babi leaders of the time represented themselves as participating in a pleroma of divine manifestation, similar in some ways to that claimed by Sufis or mystics). In June, 1851, the vizier put pressure on Bahá'u'lláh to leave the country, which suggests that the government had by that time infiltrated the Babis and discovered who the community's real leader was. Bahá'u'lláh went to the shrine city of Karbala in Iraq, the site of the tomb of the Imam Husayn, where a small but active Babi group existed. He found that it was led by a Sayyid 'Uluvv, who had made claims to being God incarnate. Bahá'u'lláh faced the man down and convinced him to retract those claims. On the other hand, during his stay in Karbala between August 1851 and March 1852, Bahá'u'lláh told some of his close companions that he was himself the return of the Imam Husayn, whose return Shi'ites expected after the advent of the Qa'im or Mahdi.

(Juan Cole, https://bahai-library.com/cole_encyclopedia_bahaullah)

Why so many Babis were mad at claiming divinity?

According to Samuel Graham Wilson, Opium smoking was common among the Babis.

Subh-i-Azal states in a letter to Edgard Blochet, keeper of the Oriental Manuscripts section of the Bibliotheque Nationale in Paris, that:

"I simply wanted him [Baha'u'llah] to keep his silence and not compel me to denounce him. In the end he could not contain himself, and by taking an overdose of opium, he threw down the gauntlet, lured thereunto by the temptations of the bald soap-seller [i.e. Mírzá Aqá Ján of Káshán], and by his brother [Mírzá Músá Kalím]."

https://archive.org/details/TheReligionOfTheBayanAndTheClaimsOfTheBahais

There is a reference to Baha'u'llah's smoking drugs (opium) here also. Hope this book will be translated fully, some day, in proper English.

Source : https://www.reddit.com/r/exbahai/comments/hg6oji/why_claim_divinity/

https://bahaism.blogspot.com/

https://bahaism.blogspot.com/