Never said he should be murdered. Im strongly against the state having the power to kill anyone regardless of their crimes. However, he absolutely should have the book thrown at him for all his crimes, insurecctions, hate speech, election interference and whatever else that puts him behind bars for life.
Also, the nazis didnt start out with genocide. First there intention was to rid their problems by mass incarcerating their enemies. Sent them to labor camps for "reeducation". But between the lack of giving a shit about their enemies and lack of resources to keep people alive, those camps quickly turned to death camps.
We don't need their word for it... they recorded everything they did. They initially did not intend on systemic genocide they ended up doing. That doesn't mean that didn't intend on not doing other atrocities. It's much like people don't intend on torturing and abusing prisoners after being sentenced, but they often look the other way when the guards do it.
if one had the power to do so, one wouldn't need to murder anyone. simply changing the variables that led young Hitler down the road. Preventing his service in WW1 alone would had completely changed the course of history. Or giving him painting lessons so he wouldn't been kicked out of art school.
But thats not really the argument here... we're staring at 1932 Hitler.