Cancer is just a specialized case of evolution that in many instances is turbocharged by genetic instability...essentially the biological form of 'move fast and break things'. This results a very adaptive germline that handily outcompetes everything constrained by purpose while also overcoming novel threats thrown at it by the greatest medical minds of our time.

If it didn't kill people that we love we'd marvel at its capability.

Is Facebook a 'cancer'? I think it's more of a cultural radiological device that exposes the cancer that's already there.