Not a fair example at all. That stuff was being carried by a Real American Hero, who aroused no suspicion... oh, wait, he had been caught with a smoke grenade.

That stuff was being carried by a Real American Hero, who had a perfectly rational explanation why he was carrying a prohibited item in his bag and was thus completely above suspicion after it was confiscated...

Wait, that still doesn't add up.

Okay, I've got it:

That stuff went through a checkpoint staffed by abject morons who complete disregarded TSA SOP and basic common sense in failing to escalate to a thorough hand search of the bag after a prohibited item (one which I believe is actually illegal to possess) was found in it. Yup, that's about it.