I didn't know about the rape treatment

You would have known about it, had you read the link we are commenting under

I mean by objective moral standards. I'm not a moral relativist, and so modern morality that doesn't correlate with most of human history means nothing to me. Law is not morality. But apparently to you it is.

You're arguing the wrong side. You're supposed to argue the other way dipshit. You're saying "law is NOT morality" but you should have said the opposite: "law IS morality, so if what he did was legal in UK then it wasn't immoral"

That's what you should have said, but instead you argued the opposite, whoops.

So let's say, a person, John, travels to country A, where they don't have a law against murder.

And John kills someone while in country A, because it wasn't illegal, so he had no police troubles.

Now John returns to country B, where murder is illegal.

Is John immoral? Is John a murderer according to morality, even though not under the law.

You said "law is not morality", meaning the moral code is separate from the law - so you're saying, yes John is morally wrong, he's morally a killer even though the law of country A says different.

If the law IS morality, then John is not immoral, because he followed the law