Aaaaand here we go again..
Limiting export mainly means that someone will make a LOT more money when they sell it anyway (because that WILL happen, make no mistake).
We saw this with the Prohibition (many a US fortune was built on that), we see it with the war on drugs (which is why it takes so long to legalise some as vast profits will vanish), we saw it with export restrictions on encryption .. the list of evidence that it doesn't work is pretty long.
Don't get me wrong, it would be really good if we could stop bad guys getting hold of tools, but the harsh reality is that if there is interest, a way will be found - remember, there's profit involved, and from what I have seen so far it strikes me that especially US companies only follow rules that get in the way of profit if getting caught is too costly - not that there aren't EU companies that do the same, but I may have a bit of confirmation bias here.
I think it's OK That they are trying, but without means to detect anyone breaking the law (which, ironically, would require surveillance and intercept) it's a lot of noise, and extra profit for some.