Canada

and the US uses stupid irrelevant stuff like this to deny entry.

One of my friends was in a blockade against clearcutting some irreplaceable old growth forest 25 years ago. The government of the day... the NDP, but that's another story... were so determined to end it in favour of the logging companies that they arrested over 800 protesters and charged them with criminal contempt of court. Because it was a criminal charge, no matter how hokey, my friend can't enter the US, but she can go to other countries with no problem... as long as the plane doesn't fly over the US.

I mean seriously, what threat is a 65 year old vegetarian pacifist? Yet that is exactly who they DON'T want in the US, pacifists and pot smokers.