Sometimes it's for learning and CD, but sometimes some people are just s*t. Cancer also mutates and reproduces, from dead horse especially. What it lacks, is their own spirit. It doesn't produce original and useful for others stuff. It's always difficult to communicate with it and discuss something in constructive manner, no matter what context is. They basically eat their own s*t. Best thing is ignoring it. If it's aggressive, then learn and utilize it.