Many of us would be dead if not for modern medicine, BUT...you all assume we are the weak ones but what about modern man's attempt to abolish everything that is innate from our primal lifestyle. Just how weak would we be if we didn't end up doing a lot of things we do today.
Let's see...we don't eat the foods we were designed to eat, we inject ourselves with diseases, we don't squat, we eat foods with hundreds of preservatives and foods that are genetically modified, we are too sedentary, we don't get enough sunlight, we use prescription drugs that, although will work in the short term, end up hurting us more in the long term.
Although most classify Crohns as strictly genetic, I doubt we would see the amount of cases of IBD we do today if we didn't do a lot of those things.
If modern man didn't make an attempt to exterminate literally everything which we are naturally supposed to be doing, I'd venture to say a great many of us wouldn't even be on this forum.
But again, that is the dilemma of living nowadays. A huge percentage of our population wouldn't survive without grains and milk, we wouldn't be able to feed the amount of mouths we do without those preservatives, a lot of people would be dead if it weren't for those vaccines.
Basically what I'm saying is, I don't really think we are weak we've just been screwed because of the way we live nowadays.