The defence of Ukraine by its citizens and the swelling of its armed forces through volunteers and the conscription of men has surely diluted the fascist threat and influence of the likes of the Azov Battalion. A little bit of support, goodwill and solidarity for this defence could go a long way towards marginalising their like, whereas abandoning a legitimate resistance would surely have the opposite effect.
Neither would there be much prospect for peace; which can only come about when Russia is forced to negotiate, concede and is driven back as far as possible to a point acceptable to Ukranians. Which it likely will be. I also wouldn't want a liberated Ukraine seeing itself as alone, friendless and with a fascist minority able to make hay with that narrative. That is, in the aftermath of an unprovoked war of aggression committed by a foreign country who talks about wiping Ukraine off the map among other things. One which sent in an army that is quite willing to murder, abuse and loot defenceless civilians en masse.
And that's before you get into the prospects for other states which could well be in the Russian Governments' sights in the future if their brutal war of aggression isn't checked. There's a mass of people willing to step up and do that, and they asked for help e.g. in terms of arms and equipment to be able to do it. And that vital support should continue. It's not about being 'gung-ho' or endorsing the nastier elements in Ukraine, but about offering support and solidarity during a dark time for Ukraine.