Here's an example demonstrating why this is insane:

Suppose North Korea sends you a letter demanding that you take down a blog post joking about Kim Jong-un being chubby, because that's illegal in North Korea. Do you feel obligated to comply with that demand? After all, your blog could possibly be read by someone in North Korea.

I don't have anything against the UK. They've been our good buddies since a spat we had a couple hundred years ago. But I feel every bit as obligated to follow UK law as to obey North Korean law, which is to say, not at all.