Look at all the types of videos YouTube de-monetizes, do you think YouTube wants to pay for hosting and make no money on the videos? No, that's all the types of videos that large advertisers (which pay the most) have complained about over time.
Of course they want to, that is why they are doing it. They'd prefer to keep the network effects going because they know an exodus would undermine their for-pay videos.
If they weren't happy, they would delete the videos on demonetisation. They don't have to pay for hosting. They know these videos are drawing in a valuable audience.
Accounting for business owners likely leaning free-market, it seems improbable that they mean 'Trump supporters' when they say 'we don't want to advertise with neo-nazis'. They probably mean literal neo-nazi.
I don't mind if literal neo-nazi are moderated off a channel. Nobody likes them.