Wait, so the cop can lane filter? This isn't stunting?
For people using phones at red lights, I don't have a problem with this, assuming they are ready when the light goes green again. If it has JUST turned red, and they bust it out to send a quick text (where it is down before the other lights even go yellow) then it's completely impossible for any damage to occur.
Honestly, the people I see doing the dumbest **** on the road are people who are just talking to their passengers (or they don't have an active excuse besides just being terrible drivers). Some people just have a higher capacity to perform a given task than others (some people can text, talk, and drive better than others can just drive).