They needs to be 'weapons', used intentionally. Would you call a tsunami a 'geoweapon'? Or Chernobyl a nuclear weapon (better example, as it's a man-made accident)?
Can you store a tsunami in a lab?
I guess keeping the worst of the two example, and merely saying the better example was Chernobyl was giving flank to uncharitable cherry picking.
I might soon join the "Back in the days, HN was a better place" crowd, am i that old?
Tsunamis and chernobyls would be difficult for a human to leak from a lab indeed, my word salad friend.