What has said that is so earth shaking here? That the UN should stop calling themselves Peace Keepers?
It appears you wish confrontation. Fine.
The UN is not the subject of General MacKenzie's comments. Having been on peacekeeping missions, he correctly points out that CDN troops are going into areas of conflict and will engage armed individuals. It isn't about monitoring truces, walking borders and working checkpoints anymore. It hasn't been for years.
The missions have changed, and that's what makes them more dangerous for the troops sent there. A different skill set is needed to deal with the situation. Peacekeeping used to involve easing tensions between individuals or groups of people. Negotiation, avoiding gunfire and waving the UN flag was the old way of doing business. That is impossible to do these days. Factions are still actively fighting in these areas. They don't give a rat's ass about blue berets or maple leafs. They are just aiming points. These groups will engage any soldiers who they do not recognize.
There is also the political minefield at home. Politicians and Canadian civilians will whine at the drop of a hat when the shooting starts. And it will.