You not caring about something is vastly different than a brand caring about something.
Brands supposedly pushed Google in to the "adpocalypse" and other types of ad revenue purges. Why? Because supposedly their content was being shown next to uncouth content. Content still allowed on YouTube (read: less extreme than hardcore porn).
So, now you tell me. Why should it be OK for Google to do what they constantly take money away from others over? And over less serious content, no less.
It's about the hypocrisy. If you cannot see any, you're not looking. If you don't care about hypocrisy, then you're just a fucking idiot.
Come on, you do know a lot of people take offense at porn for various reasons, right? And most mainstream brands don't like being associated with offensive stuff...
Anyway, nobody's saying certain sites shouldn't be allowed to have ads. The issue is which ads are shown on which sites. Advertisers don't want their ads showing up next to content that their target audience might consider offensive. They also don't want to waste their ad budget showing ads to people who aren't likely to respond to the ad. The ability to pair ads with content that appeals to a certain audience is the whole reason Google is such an effective advertising platform.
Most mainstream brands don't like to say they're beyond willing to be associated with offensive stuff as long as it makes them money and they can pretend they aren't associated with it. Google knows what they're doing and they're more than happy to take the bad press, which won't effect them in any meaningful way.