In particular, by the time a problem becomes prominent enough to be noticed by politicians, it has often already been solved and the ensuing legislation is nothing but a deadweight loss.

For example, before 9/11 the assumption was that hijackers would try to ransom the passengers for money, so it was better not to resist so they didn't hurt anybody. After 9/11, the assumption had to be that they were planning to crash the plane, at which point all the passengers resist and a hundred passengers can easily take on half a dozen hijackers and it's well worth the risk of one or two getting hurt in the process.

So by 9/12, another 9/11 was no longer possible. It was already solved. None of the government action that followed was actually necessary and the TSA is completely pointless.