I don't think they should be checking out bags, period...or anything else for that matter. They should simply have more/better security and really rake the people who do something stupid with their choices to the fullest extent of the law.
A large portion of the population is overly concerned with being 'safe' from terrorism, hate to burst a bubble, but there is no such thing.
I'd like to ask people to consider putting their freedoms and liberties ahead of a small measure of temporary safety.
Benjamin Franklin said it best:
Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety.
~ Benjamin Franklin
From the Historical Review of Pennsylvania, 1759
Think about that one for a bit....
In case anyone is curios, no, I don't bring weapons or anything else stupid into amusement parks, jets, trains or automobiles... the point being that common sense needs to be used by every single voting (or non-voting for that matter) citizen of the United States.
As a nation, (generally speaking) we've handed over way too many of our liberties and freedoms and asked the government to step in, instead of the people trying to use their brains and common sense to find a solution. They're supposed to work for US, not us for them.