> why should anyone object to that?
Because, as is traditional with with religious lobbies and the Mary Whitehouse Brigade and so on, the objection is "We don't like it, so *you* shouldn't be allowed to see it, just in case it makes you do something bad..."
Unfortunately, as with all such prohibitions, it only makes the "forbidden fruit" even more attractive and does nothing to actually stop the behaviours (such as rape, abuse, misogyny etc) which happen whether or not the viewer has seen it.
Regrettably, however, because of the "shame" that society surrounds such things with, few people are willing to stand up and say "I like this, I want to see it", so the politicians pander to the vocal minority knowing that it will go down well in the hypocritical media (Daily Fail, I'm looking at you) with their claims that they are "protecting" us/ society/ women/ children from harm, when, in fact, they're causing the opposite.
Google have, it seems, fallen for the same short-sighted view.