Yes, I know how you feel, I didn't think the use of extreme hyperbole would need to be explained, but the lefties on the board hounded me on it non stop.
The problem with your above is that the term reasonable is subjective. Is it reasonable to enforce seat belt laws? to force motorcyclists and cyclists to wear helmets? probably... but even those are debatable. The TSA is over the line as its restrictions and regulations do not make air travel safe from terrorists. The potential ban on the size of soft drinks in NY is way over the line.
And most agree that the latter is way over the line. That proposal has been met largely with ridicule.
It tends to be a societal consensus. If there were things that we couldn't live with, the politicians would know about it. The fact is, MOST can live w/ and don't have much problem w/ airport security as it is.
People use the term & concept of "infringement on liberty" much too loosely. A minor inconvenience just doesn't rise to that level. Liberty is the ability to do what you want to do; I can still fly wherever I want. I just have to take off my shoes for a minute to do so. It's not a big deal - and again, MOST do not see it as such.