Why Baha'u'llah arose, with a divine power and might?

All the powers and nations are convinced that the aim of this community (the Bahais) is the harmony and unity of the world. They never join in corruption. They want to become the cause of the life of the world and the means of safety; awakening the souls and the cause of the spirituality of the creatures; life-givers and not life-takers. In the beginning of the Cause, the Babis (Ezelis) brought affairs to such a state that safety was utterly lost and they put the lives and property of all at stake. What a dilemma it was! What implications, vice and immorality took place! All of the people became assured that the Babis (Ezelis) were the enemies of the lives, property and the honor of humanity and that they were blood-thirsty, immoral and evil-doers. In Teheran, during the incident of the Shah (Nasser-el-Din Shah was shot by a boy), I remember hearing an akhond (Mohammedan priest) crying, 'O people! If you want to worship God and the prophet, if you want to protect your lives, property and honor, kill these Babis. They are the enemies of your possessions and of your honor. They are against the laws and religion.' All of these events took place, because Mirza Yahya (Ezel), Seyed Mohammed, Mullah Djaffar Naraki and such men, held disreputable gatherings every night and day. They were engaged in immorality and vice. This is why, in the history of the people, those calumnies were attributed to the origin of the Cause. They wrote that the Babis allowed each woman to have nine husbands. Therefore the Blessed Beauty arose, with a divine power and might. He removed all of those implications, unfurled the banner of holiness, pitched the tent of universal peace and called the people to faithfulness, good morals and peace.

(Abdul Baha, Star of the West)

https://bahai.works/Star_of_the_West/Volume_9/Issue_3/Text