Exactly. The thing about drivers in pursuit, they ALL have to stop sometime. Trail 'em with a chopper then snag 'em when they stop.
Problems with this! The chopper loses visual contact if there are high buildings, etc. This gives the guy time to run into a parking garage of whatever and run on foot.
If he is armed and dangerous - he could cause a lot of harm.
Best to stop him when the police have him in their sight.