"Why do we need source control? It's all there, right on my laptop. Source Depot is just a bunch of trouble." I've threatened to withhold paychecks from employ

"Why do we need source control? It's all there, right on my laptop. Source Depot is just a bunch of trouble." I've threatened to withhold paychecks from employees who have said this to me. The job isn't done till the code is checked in, building, and backed up.