Explosive liquids and what to do with them
You and I aren't allowed to carry our own drinks through security at the airport, although we are allowed to buy them at the grossly inflated prices in the departures lounge, which is nice for someone. But what happens to the drinks and toothpaste and stuff being confiscated from people?
These morons don't seem to have heard of hypergolic fuels, which burn or explode when two substances are mixed. Many are liquid, and don't require any kind of spark or igniter. So pouring all those oh-so-suspicious liquids into a bucket, or mixing all the tubes of toothpaste and stuff in one bin which will just get crushed (boom!) seems really quite daft.
Of course, I don't really think they're morons. Traitors maybe, but not morons. They have heard of hypergolic fuels, and they don't want random explosions in airports. The logical conclusion is that they know there is no threat from liquid bombs on planes. Why they would therefore make you buy your bottle of water in the departures lounge and restrict hand luggage I leave up to you to decide.