What you say, absalom, is true, but it needs clarification.
Young men are at higher risk from car crashes than old men. They drive too fast in older cars without modern safety features. Their fitness will help them to fight off a viral infection but it will not protect them in a high speed car crash. Being at higher risk from one way to die does not make someone at lower risk from some other way to die. Car crashes are discrete events, you live to fight another day or maybe not. Epidemics are chain events. A gives it to B who gives it to C, so although most members of the chain will survive, eventually it will find it's way to someone who is not so lucky.
Like the pile-up in Jacques Tati's Traffic, but a lot lot less funny.