Your question is a very good example of why using the word “peacekeeping” lets us fall into a bit of a trap. If we're only going to go once there's a peace, why are we going?
The modern-day concept of peace operations is to help create the peace environment and, as long as we continue to call the military arm the peacekeepers, to bring in the peacekeepers to ensure that security is available to create the environment for peace discussions and provide the security to enable the participants to come to the table.
Right now there is a fragile peace to keep, but around the edges it's pretty messy. Those are, as Marie-Joëlle has explained graphically, unfortunate characteristics of current conflicts.
Is there a peace to keep? That's not the question, as far as I'm concerned.