I just wonder

It doesn't just make sense. As you pass through airport security, they take knives, scissors and even nail clippers from you. But have you wondered how it is that when you're being served the lousy fare that passes for a meal, the cutlery you're given is definitely not plastic.

OK. OK. It's against terrorist code of ethics to use airline cutlery as weaponry. In fact the captain would laugh at you were he to see you brandishing an airline table knife.  But show him just a hint of your nail cutter and he'll readily take the plane wherever you want.