Well, you can if you want to acknowledge the reality that people who do evil things don't necessarily only do evil things.
The striking thing about Hitler is that he was able to persuade many Germans that his principles were on balance constructive ones. And some things turned out well. His economic policies ended the Depression in Germany. Lots of government expenditure at a time that markets weren't functioning well and lots of people were unemployed. He put them back to work.
The fact that a lot of what they were making was autobahns was a great idea. The fact that other things were tanks and airplanes was a clue as to where he was heading. But the might this produced made Germans proud.
A politician can't say these things. But if we are to understand what people who do evil things look like, we have to remember that they don't wear horns or have cloven hooves.
The people most inclined to do evil things are those most inspired with an idea they think of as virtuous.
One of the things that made some Germans support him was that he appealed to a nostalgic idea of what Germany had once been, in purer times. That resonated.
But in the mind of a fanatic, we know where that led.
Now think about Trump's appeal to some Americans. Similar.