yes true, there are some islamic radical groups with, twisted beleifs and thinking (as well as the priest jhon in usa and others like him) but more serious
but not the teachings of islam... there's a difference, also i mean the real islamic teachings, the non extreme one, not that some radical groups make and follow and have some twisted purposes, like those who think that women must be locked at their homes and not work or study and etc...
I don't believe you. You can find justification in Islam for all these things. Jihad can mean a personal struggle, but it can also mean war.