To be entirely honest, this is totally natural behavior and if a species doesn't self-correct itself then nature will interfere.

One of the things we tend to forget/dismiss/refuse to even notice is that for the past few decades (around) nature has been looking for the disease which could correct our ever growing population levels and thus also stabilize the planet. Nature often came close, diseases like HIV (unnoticed incubation period) and Ebola (speed of contagion) were almost perfect when observing their lethal nature and most definitely their virality.

But our medical and scientific prowess has so far been able to adapt and win even.

Those diseases weren't accidental, they are the similar to the Black Pest in Middle Age which when looked at neutrally happened mostly in large cities, overpopulated and overcrowded unsafe and massively polluting locations. In other words... a correction.

And so far, the only surviving killer nature still has on its hands... slowly but surely we are winning the fight against. The mere question right now is who is fastest: our science or can the Big C. go more viral and affect ever more as predicted.

TL;DR: the animal species that is humans is self-destructive just like most other species and if it fails at doing such, nature will intervene and correct the situation to maintain the stability of the planet. We all deem ourselves that smart a species that the majority even doesn't recognize we are killing ourselves as a species. Whether that happens with or without technology and progress is pretty much irrelevant.