Every nation has a right to protect itself

If we accept this as a fundamental principle of international law that has a universal application, then:

http://www.arabnews.com/node/1063011/middle-east

then what is the beef?

If you disallow them the right to do this, then you cannot claim the right to have an equivalent US system on your soil, can you?

What we state here is a mere extension of what R. G. Ingersoll stated ages ago:

You cannot claim a right for yourself 

unless you allow it in another first, e.g. free speech.