He's not incompetent. He knew it wohld happen. This is where liveral minds can't comprehend what's really happening. Incompetence would suggest he genuinely thought the ceasefire would hold up and is now completely surprised by the violation. Which is a false belief. Liberals revel in holding false beliefs, especially about Trump.
It's fascinating to see a group of people willingly say the wrong thing just because they don't like someone.