Well Hitler is quite the example of 'bad person' as he exterminated millions and started a war involving millions of other nations. There are reels of old film which later were transferred to video and uploaded to the internet for educational purposes. Probably because historians want people to remember what an evil dictatorship was like and who was behind it.
Yet that is even being called into question by You Tube:
YouTube blocks history teachers uploading archive videos of Hitler
Was Thomas Jefferson 'bad enough' to consider taking down his statue?
Remove the Statue of Thomas Jefferson from Campus
Was George Washington 'bad enough' to have his memorial taken down at the church he attended?
George Washington’s Virginia church taking down his memorial
Should any monuments to leaders or politicians who cheated on their wives, treated their family and others unkindly or any other transgressions be struck from history? If so then calls for FDR, all the Kennedys and Martin Luther King Jr. should be considered as well.
None of the founders or American heroes mentioned above were 'saints' and 'choir boys.' There's a reason for that...We are all flawed and sinful human beings. Those seeking out to remove from history people who were not perfect or far from it should look themselves in the mirror. We are all fallen.