I'd more argue that it's childish to argue if Hitler was evil or not because the answer is such an overwhelming yes, you have to have a warped moral compass to disagree.
Like sure, short term he helped to bring Germany from the weakened post WWI state it was in to a thriving economic powerhouse, but what he was doing wasn't sustainable even without his visions of ethnic cleansing and conquest.
But anyone who would stoke the flames of hatred like he did, engage in such reckless violence as he did, and engineer genocide like he did IS evil. People often compare Stalin's death toll to Hitler's, talking about how one is considered evil while the other person was responsible for more death. Aside from being portrayed in a slightly better initial light because he was a member of the allies, Stalin didn't really "try" to kill as many people. Sure, people died in famines and labor camps, but Stalin didn't have the methodical way of slaughtering people that the Nazis did.
If for whatever reason the famines, droughts, and bad conditions didn't kill the (higher estimates of) 20 so million people, Stalin and the CPSU wasn't going to make sure they died. Hitler and the Nazis happily eradicated 12 million+ people and would have done more if the war didn't stop them. That's the difference.
Saying he had "some bad ideas' is such a gross understatement it honestly becomes a straight falsehood. His goal of "Helping Germany" was based on eradicating various ethnic and other groups. It is built on evil.