Whether or not this is a good thing is a complex question. If you happen to be the target of this hatred and violence, and feel it is an existential threat to your livelihood, you might believe that it is a good thing to make it more difficult for those who are engaging in this behavior to enlarge their communities. On the other hand, if you believe eliminating communities by platform fiat is an existential threat to your livelihood, this may seem like a very bad thing.
(You might also think it's hypocritical, since you can access most of these communities via a browser. Google also controls the browser, and does make it difficult already to access some sites https://developers.google.com/safe-browsing/v4 . However, it does seem to have a higher bar for browsers than for social apps (e.g. malware, csam, iirc); some have suggested that there are legal reasons for this, I'm curious to learn more on this, but I have not seen any substantiation yet.)