this is true for just about everything, there is always some as outliers for whatever but isn’t true in general. there are people I believe are rotten to the core but would never wish any violence against them
A significant proportion of people are ok with violence as a means of solving problems. True pacifists such as yourself are relatively uncommon. And even if it was rare to be ok with violence (it's not), those few who behave that way force violence on the rest.
Are you kidding? Read the news. Many Americans are totally fine with dropping bombs on other countries (which, you know, kill human beings) if they feel that their cause is "just". They're also OK with violence against human beings in their own country if those people happen to not have the proper documentation, or they're protesting against violence.