Security on flights to the US is to the same standard, if not carried out by the same organisation, as flights in the US.

For airports in Europe (which is where the two flights in question originated), this is basically true. For airports in other parts of the world, not so much.

In any case, that doesn't change the fact that it's incorrect to blame TSA for incidents on flights that TSA wasn't responsible for screening. The relevant factoid for the point the person upthread was trying to make would be how many such incidents have occurred on flights originating from a US airport.