pretty retarded as a casus belli
As far as retarded casus bellis go, I know a couple:
1) Let's wreck AFGHANISTAN, after 15 Saudis, two Emiratis, an Egyptian, and a Lebanese attack skyscrapers in New York. Also, let's not ask the Saudis any awkward questions, and for further assurance - let's make it illegal to investigate in that direction.
2) Let's attack Iraq, because some washed out lowlife that was ousted by Saddam says they are buying "yellow cake" in Niger. Let's trust this guy fully, and ignore all the other evidence that indicates this is a fabricated story.
3) Let's bomb Libya back to the Stone Age, because the Ghaddafi government is doing TOO GOOD A JOB pushing ISIS-backed Islamists back into the desert. This mission should be especially easy, because we fooled old man Ghaddafi into surrendering all his WMDs just a few years before the war. Amazing that - let's bomb Saddam because he MAY have WMDs, and... let's bomb Ghaddafi because he DOESN'T have WMDs. You can't win against the West - damned if you do, damned if you don't.
The common thread throughout... is that there really isn't anything you can do to avoid being invaded by a Western coalition. Not having anything to do with some tragic act, is not insurance against it being blamed on you regardless. Having weapons of mass destruction, or not having them - doesn't make a difference. Fighting Islamist terrorists - or aiding them - doesn't matter either.
If they want to f*ck you - they will f*ck you.