Well, the key part is that the Axis was centered on the imperial ambitions of a a famous genocidal dictatorship that you've probably heard of. There's pretty much a unanimous consensus that that dictatorship was very, very bad and its allies were not much better.
Regarding the recent violence, here the context:
1. BLM is mainly against the police's pattern disproportionate killing of black people, often unarmed, and racism in general. While there had been looting and rioting, it's worth noting that from the very beginning there's evidence that these protests were actually infiltrated by violent agitators with other aims (e.g. https://www.nbcchicago.com/news/local/illinois-man-accused-o... and https://www.theguardian.com/world/2020/oct/23/texas-boogaloo...).
2. The capitol attack was literally against the results of a free and fair election, and deliberately attacked some of the actual institutions of American democracy. There's also no evidence of infiltration, though such claims are now being made to deflect blame. And the riots often loudly expressed violent aims (e.g. erecting a literal gallows and chanting "Hang Mike Pence" https://www.snopes.com/fact-check/hang-mike-pence-chant-capi...).