I'm sorry mate, but this is just excusing and apologising for Nazism. Arming these people is beyond the pale.
What's funny, is the pro Ukraine acolytes, like you see in this thread, want to pretend it isnt happening. It's incredibly insulting to people of colour, Jewish people, the LGBT community etc. Arming these scumbags isnt the answer, and will cause more harm than any good.
I'd suggest it's less to do with pretending it isn't happening and more a reality that, like Mutz mentioned, desperate times require some questionable measures.
The Azov are a real danger to the stability of eastern Ukraine and beyond once the war is over, however there's a greater danger to Ukraine now without them.
It really is a difficult situation with no unblemished outcome which option they choose, but rightly or wrongly it's a situation Ukraine finds itself in.
You only need to look back over the last hundred or so years and see some of the reprehensible alliances (more often uneasy acceptance) for the greater good.
Some will call it pragmatism; some will use words like amoral; others, perhaps rightly, will think its lamentable, but it's easy to say so when not in position.
As stated otherwise, I personally think it'll be best to judge when they're not required although let's not pretend that it'll be a clean affair afterwards.
Ukraine is fighting for its very existence.