They think this is so anyway, in spite of the results of those world wars, and that’s the problem.
The Second World War was not an intervention; Germany declared war on us.
Re Germany declared war on us:
I think that if Hitler could have had a do-over, he would have taken one here. But, we probably would have gotten involved anyway—FDR wanted to, and Winston Churchill was understandably urging him to do more than just supply materiel.