Do you already know the answer to that?
They can and choose not to, someone used their own 2012 tools they developed in a scientific paper (detection of Nazis)
Nobody controls their own data, it’s not FB it’s all data mined.
How can you trust Facebook? I refuse to use their rebrand, you don’t give trust, they earn it. Did Facebook earn your trust?
The proof they can detect is is they use it to advertise. https://www.latimes.com/business/technology/la-fi-tn-faceboo...
Nazis are pretty easy to detect (caste discrimination can be trained, anti Muslim sentiments are easy too, but this is a low hanging fruit).
Like Leary said, do they care?
Facebook obviously can do it, they’d rather sell ads and use the users as marketing data instead of removing them, until they need to virtue signal. I can’t find the paper but I doubt anything I said is a surprise. These tools are used to make money, not moderate.