They acted very much how they should have in the situation they were in. They are not regular police and their tactics are very different. They were addressing a threat, and they were NOT that bad. For about 60 seconds the guy was somewhat roughly handled. After that he was just questioned.
You're right, they're not regular police, they're SWAT. They're members of an elite unit of highly-trained officers that, supposedly, should be ready for extraordinary and risky situations, and also supposedly passed psychological tests during the selection process. I would hold their conduct to a much higher standard than regular police, even considering the difference in tactics.
Yeah, they didn't punch him, they didn't tase him, they didn't blow up the building, but they certainly did not seem calm, orderly or disciplined, which is the best way to respond to any dangerous situation last I checked. If this is how they deal with a passive dude at a computer, I wonder what would happen if he had a gun and hostages?