[image deleted]Do you mean the like some of the Puritans who were settlers in some of the original colonies in America? They were Congregationalists from the Church of England who made sure that theirs was the official "state" church (before there were any actual states) and they would kill Baptists or anyone else who didn't agree with their doctrinal interpretations and applications. They killed many people.
Some of them were misguided Christians but like in all sects or denominations of Christianity there were undoubtedly false converts in their midst as well. It is wrong interpretation and application of the bible that would lead to a Christian participating in such atrocities.
However, there are biblical principles that say if anyone (even those who call themselves Christian) has unrepentant hate, anger, malice in their heart or any number of sins constantly in their lives they will not inherit the kingdom of God.
If you would learn those principles (you don't have to believe them) you wouldn't have to use the fallacy of anecdotal evidence or misplaced vividness to argue against an entire system or group that has/had (for a time) terrible biblical interpretation. You could have an argument against the actual hateful people calling themselves Christian who could care less if you died. Interested?