Ban people who send hate raids for longer or permanently. Hate raids are intentional and planned and are bad for the community. Hate raids against high profile streamers will always gain the person some support because the higher the profile person the more people there will be who also don't like them. Being soft on hate raiders will incentives harassment as an avenue to gain an audience and reward people for harassment as they will have popularity and attention for it when they return in 2 weeks time.
If harassment is incentivised more people will do it and twitch community will become a cesspool, and a hateful place. And aren't users free to watch their favourite streamers without experiencing targeted harassment at the streamer or themselves?
It's causing issues because the response is soft. Encouraging hate raids isn't just free speech it's encouraging harassment in people place of work.