We do ask this. It's the entire reason we vote in representative democracies. It's absolutely nothing like the question you're replying to.
> In any society, we have some basic rules of 'good' and 'bad', and it's totally ok to test a website on those measures.
The basic rules of societies for what is 'good' and 'bad' about websites is something that you have entirely invented here in order to make an empty, unnecessarily dismissive argument.
Here's my answer: Google decides because our governments have abdicated responsibility for regulation or enforcement. Therefore, the responsibility is taken up by the groups in the best position to exploit it for money.