You say preventing copycat attacks, I say it's a purely reactive approach towards security, which does not work.
A man tries to set fire to plastic explosive in his shoes, so long queues form (in airports) for people to remove their shoes.
Intelligence comes in about liquid / gel / paste explosives, so now those long queues have to abandon any liquids / gels / pastes in bins, near those long queues, inside an airport. Those "potential explosives" are not allowed on a plane, but are allowed to be left for hours (days?) near lots of people in an airport.
And what crimes happen in the vicinity of their screening area that could be prevented?
No, he wants real cops.
In France, in public places like railway stations, the "plan Vigipirate" makes use of the military (including gendarmerie)
Whether or not you think that the TSA should be involved in anything past securing the ability for persons to travel is the question.