The masking up thing is weird. I mean, some or all of them might well be peaceful protesters. There may be valid reasons for a peaceful protester to wear a mask .... But it's something you'd definitely do if you were intent on causing trouble*, and that's kind of the point.
Fully support people's right to protest on this. I don't agree with Israeli teams being allowed in to UEFA competitions (or Eurovision, or anything else like that) when they're engaging in apartheid and committing acts of genocide. I'm not on their side here. But I think it's also sensible to not have stuff like that going on around Villa Park for this specific match. It just screams of putting local residents at risk, which is to my mind not at all acceptable regardless of how just the cause is.
* I feel the same way about the flag stuff going on ... I don't for one minute think everyone who hangs union flags or national flags up is a racist ... but sure as fuck every racist from Penzance to Wick will be doing that with great enthusiasm.