It is not a failed experiment.
I acknowledge that if I abuse my body, malnourish or poison it, then my immune system will not work as well.
So I exercise it, I properly nourish it, I ingest and expose it to as few toxins as possible.
When I look at all the harm done by man in his conceit that he can improve on the original design, I’ll stick with my original design and forgo the genetic modifications on offer thank you.