Why so many people say "Muslims are terrorists"  Should we say that?

I think there is always a scapegoat in the community.

Who is the most violent perpetrator of the massacre? Who?

I Think "" Hitler "!!! He persecuted 6 million Jews. With that we blame the Christians for that ?, Hitler, He's Christian ,so because he persecutes the Jews, it does not mean all Christians are like that.

Then , How about Muslims? are they all terrorists? Are there organizations that want to create a " Muslims Phobia" ?
It is inappropriate for us fellow humans to hate and kill each other.

what do you think?