Deterent.
That's really the problem though, isn't it. A government isn't usually oppressive enough to rise up against when their taking your guns away. (I'm thinking about UK, Austrialia, Canda) By the time it comes to revolution, you're basically screwed - or at least starting off at a severe disadvantage. I've had this conversation with several of my friends. What would we do if the government came for our guns? I'd like to think that we'd at least hide them. But what happens when that becomes a class 1 felony punishable by 60 years? Is it worth the risk, or do you just give them up and hope for the best? I just think it's sad that several countries have let it come to that. That's not to suggest that the US won't follow that same path.
Actually, I'd say it was surprisingly effective at Waco. 50 men held off 100's of trained law enforcement officers for 51 days. The initial raid by 75 ATF agents was repelled, killing 4 and wounding 16 agents. The defenders had 6 killed and 3 wounded. Sure, all the branch davidians died in the end, but the results are still impressive for such a small group of people. (no matter which side you side with) http://en.wikipedia.org/wiki/Waco_Siege/
He is the #1 threat to individual rights and freedoms in the UK and possibly in the whole of Europe. Think Palpatine, only with fruitier ties.
It's too bad you folks in the UK let them take your guns away, or you might have other options available to you. (At the very least, the UK government might fear the people instead of the other way around)
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