We fought a whole war about it. The ones left alive got moved into high government positions with project paperclip, leading to the right wing course we've been on ever since. At a minimum they need to be made afraid to broadcast their bigotry.
Don't fall for it. The majority are apolitical. If the dems had given anything to regular people the extra non voters that came out against trump in 2020 would have come out again. The failure of democrats to bring out voters doesn't imply the non voters are Nazis. It implies the dems aren't really that worried or they would have made concessions to the regular citizens instead of making sure "nothing will fundamentally change".
That parts easy. They voted against trump and got absolutely nothing for it. They went back to being non voters because the dems showed they weren't going to do anything better than trump just had.