I've just remembered that I actualky did use to know a woman who was dating a neo-nazi back in the 90s. Or maybe 'know' is a bit of an exaggeration, but she was a good friend of a friend (whom I'll call X for the sake of brevity) and we went out together a few times as part of the same group.
X's boyfriend, Y, was a violent, supremely stupid but also deeply insecure bona fide white supremacist with more than a few issues. His insecurity was what X and he had in common. X was also an extremely attractive young woman. She was really messed up in her own way and used to draw massive amounts of self-validation from the fact that men lusted after her and wanted her. In a lot of other ways, and certainly from a gender perspective, she was a pitiful person - but not when it came to Y.
X could have had her pick of the men and boys around town, but I truly believe being with Y gave her a screwed-up sort of kick. She was not herself openly racist as such (and has since got married to an Asian man) but used to threaten people with her aggressive, scary, gun-owning boyfriend. She certainly threatened me (and I'm white!) with Y beating me to pulp for my leftists views when we had a minor disagreement one day. In a lot of ways, she treated dating Y the way some people do owning an attack dog: she used him to intimidate people who crossed her!
I'm obviously not saying that this is what all women dating neo-nazis are like. The plural of anecdote is not data, either. But X clearly benefitted from and actively instrumentalised Y's violent racism for her own ends. IMO, that's a step further than complicit.
Wow! I hadn't thought about her in about 15 years!