Finally saw the videos (missed that they were posted)...and I'm underwhelmed.
Video #1--probably the most you had against the guy. Chirping the tires around the service area is a bit much.
Video #2--Never got the impression the tech was "hooning." Driving to ensure that the fuel pump was operating through the whole rev range, yes. He wasn't pulling the e-brake, trying to drift, street-racing, whatever. I drive like that on occasion anyways.
Video #3--Not sure if you got in trouble or something, but I can't view it. Says the video is "private."
I think you're overreacting, bro.