Mohammed was not a psychopath.
Don't make me look this up again and transcribe yet another encyclopedia article.
Mohammed was a religious leader who earned the respect of people who were sick of the corruption and murder prevalent on the Arabian peninsula during his lifetime. He became a political and military leader of necessity when his followers came under attack by the ruling classes whose abominable behavior he opposed.
Europeans slandered Mohammed to a fare-thee-well for hundreds of years. This is the source of the "information" about him that you have shared.