Why did the jacobins have so many enemies

Because those who weren't all for the Jacobin cause were thought to be secret royalists or whatever and their presense was a threat to the Committee and the Jaobins in charge. Robespierre and his allies who basically afraid and did whatever they could to ensure their grip on power was tight, obviously it did not work

Because they killed the King, wanted to control the governemnt, and were not the only revolutionary group.