Depends on who asks and when, the excuse changes to suit the occasion. But actually the excuses are just matters of convenience, the government has shown time and again that it doesn't need an excuse....it just does what is expedient at the time with little thought as to what is morally acceptable, only what will have a blind eye turned toward it, swept under the rug or justified in the view of the status-quo, in other words....they do pretty much what they want when they want and treaties be damned, knowing full well that the vast majority of voters wont give two shits as long as it isn't coming out of their pay checks.