That was by intention. Head on, the original question is less penetrable. The restatement is meant to emphasize that a symbiotic relationship between the host a

That was by intention. Head on, the original question is less penetrable. The restatement is meant to emphasize that a symbiotic relationship between the host and the virus could drive the evolution. Cancer -- bad for host, virus takes care of cancer for selfish reason, host lives long giving virus opportunity to spread. Along this line, your example gives a possible immediate attraction for the virus. It is the immediate attractions that start off the relationships, to disastrous, neutral or beneficial long term ends. It is even possible that different viruses could be fighting each other to get a piece of our cancer. Interesting stuff!