1) It is when the dictator is used to deliver that "peace."
2) Depends on the situation. "Upholding" peace where peace is barely threatened is a waste. Perhaps you should deploy troops to Switzerland to "uphold" the peace. The problem here is that your militaries don't know how to wage a war and this is why they look for ways to hang back out of the fight. They are better suited to small engagements with a gurantee that little matters either way (like Somalia) or that they wil lbe protected by America's more capable force. Seeking ways to deploy in a manner that your military is little more than a peace corps doesn't actually contribute to peace.