violence vs non-violence

so if it was hitlers way then why do ppl hate hitler so much?? when we know that our future is full of voilence then why was hitler sacked ??

if non-violence is the answer to all the questions then why do wars occur? what do u call the jingo's?? when the rebels are emerged from the ground of impeccable innocent ppl who are on a rage to distory......who can stop them?? and if they go non-voilently then what do u call the voilence that occurs during peacefull protests??

do u think the non-voilence moment of gandhi still has the effect on present generation??..