The is always much to be said for not attempting more than you can do and for making a certainty of what you try. But this principle, like others in life and war, has it exceptions.
Even here in America, we felt the cool, refreshing breeze of freedom when Nelson Mandela took the seat of Presidency in his country where formerly he was not even allowed to vote. We were enlarged by tears of pride as we saw Nelson Mandela's former prison guards invited, courteously, by him to watch from the front rows his inauguration.
We can't drive our SUVs and eat as much as we want and keep our homes on 72 degrees at all times... and then just expect that other countries are going to say OK. That's not leadership. That's not going to happen.
It is very easy to say that your opponents have been guilty of a breach of faith, but it is a great mistake to splash the paint about so freely that your words cease to have any real meaning and cease to carry any sense of affront even to those to whom they are applied and cease to bear any connection with any genuine feeling of indignation on the part of those on whose behalf they are spoken.