Maybe because extra-judicial "punishment" is unAmerican, no matter who it is.
IF we regain our country, I would get no pleasure from dragging Trump and his henchmen into the front lawn of the White House, and summarily, publicly executed.
OTOH, if they went through proper trials, were found guilty of actual crimes that exist on the books, and were sentenced to death, I would support that 100%, and would be proud of my country for proving that the system set up by our Founding Fathers can still work.