I must admit, after watching the recent programme on BBC (I think) and seeing the explosion they simulated with a couple of litres of the right liquid, whilst I don't necessarily agree with the 100ml rule, it doesn't seem quite as ridiculous as it did before.
That - and the recent conviction of some of the August 2006 bombers - just go to show that one shouldn't believe a word spoken by most of chattering classes (often found on Internet forums, funnily enough) who mouth off about how ridiculous all the security restrictions are; and how there is no risk of anything bad happening anyway; and anyway the bad people don't know how to do it; and anyway it's all technically impossible.
I remember all those guffawing hoots of derision at the idea that none of the August 2006 bombers would manage to mix up a concoction of highly-unstable chemicals carried on board in thermos flasks because they had to be kept at freezing temperature. But I'll bet that none of those people now have the decency to admit that they were looking at the wrong type of explosives.
I agree about the circumvention though. The rules are there for a reason. So if there's a way around them, then that needs to be fixed.