It seems like any virus that gets into the cells of a species is able to evolve multiple mechanisms to suppress the immune response.
This is especially impressive because the virus, a completely mindless thing, is able to manipulate pathways that man doesn't even understand very well.
And the virus is able to do this by the molecular evolution of just a couple proteins that also serve other functions in the viral life cycle. One protein can have several distinct function.
This is so far ahead of anything man can do, and maybe man isn't ready for that kind of responsibility.