Patent trolling usually implies they don’t make products and simply rely on their patents. Are you saying they should leave money on the table since they were granted an enforceable patent? Do you need another youtube video to help you decide?
A company can be a patent troll when they abuse the patent system to stifle competition and maintain their monopoly position despite the technology that is patented not being specifically innovative.
Patent examiners aren't always engineers and can't always appreciate why a patent is not novel. I say this having had a US patent issued in my name (for a technique I do believe was novel!) The documents that the patent examiner cited were clearly found on just a textual search and the one document they brought up referencing prior art was completely unrelated to the technology in question.
As is my understanding, RED took the JPEG2000 codec, which has a lossless mode, made a few adjustments, and then patented the application of that type of codec to higher resolution images (above 2K in each dimension). Since there are really only a few ways to do lossless efficient image compression, this effectively gave them a market monopoly, but didn't return the benefit of the patent to society (that is, an explanation of how the novel technology works, because, we already knew how JPEG2000 works!)
There was no novel step or technique in RED's patent, but if you put enough jibberish in front of a patent examiner, they may well bite and issue you the patent. Patent offices are often under a lot of pressure too, as there can be a several year-long backlog to get patents issued.