Earlier quoted context omitted.
It's not a matter of guilt, it's a matter of profitability. If there were advertisers beating down their doors now to get their products placed alongside Russel Brand's face they'd leave him monetised. YouTube is truly neutral here, they are just revenue maximizing, don't mistake this for a moral position. If they make a statement later, it'll be for ROI as well.
Can't advertisers just explicitly ask not to have their ads run on RB's contents? Why would YT have to take this decision for them?
There are plenty of rappers monetizing their videos. King Von was never demonetized despite being known to have killed at least 7 people. That is much worse than what Brand is alleged to have done. So this isn't a moral judgement, this is a business decision.