It can be seen whether it was enough in retrospect, but (unless we adopt your attitude, that nothing is sufficient) we must make our judgement at the time. However, I would have been happy to write ... there are checks and balances ...

I understand the attitude that says governments should protect their borders and maintain the common peace, and do nothing else, but the strings of power stretch much further than that nowadays. Less is more is not a useful standard, in my opinion.