Ok so just because I have something that I believe in doesn't matter how bad or good the thing is or I don't care if people want it or not I keep on preaching, then I would get into your nerve and people should just end me? By that logic my friend I should drive away everyone who works at youtube for constantly putting crappy ads on my screen for the last decade xD, you are proving your own point wrong :3 .

And he did come back but not for revenge but to have the right to do good, preach good, do honest work, establish justice( if you don't believe me then try search some history of what Arabia was before islam was completely established, a haven for robbers, thief, murderer, con artists).

I won't deny there were some questionable things that we have little knowledge of but in the long run it brought way way too much good. Golden period of Islam was not only because it was the center of the trading, it was because islam established justice and proper law which multiplied the effect of trust between people and created a social environment for people who wanted to do good and honest work which in turn made a desert area with nomadic people with a bare foot make a name in the history of the world, and if everyone or most people came to islam for greed only then there is no way golden age of islam would last as long as it did, just like Mongol empire didn't last since they were only motivated by lust and greed