So I should probably bring guns and explosives to the airport to lend some weight to my rights in case somebody has a differing opinion. That could turn out quite interesting...

And now I am left wondering if comments like this make it harder to get through the airport. How humorless and paranoid is the system?

Well there are few penalties for ignoring international law, so while I share your love of the concept I have to recognize that without teeth international law isn't going to protect you from a bad government, wherever that happens to be. A few people have been prosecuted in the International Criminal Court, but I don't think that's a serious deterrent to most international actors.