The idea of the WoL being a healer isn't so crazy when you can identify the parallels between the various Healer jobs and combat medicine. For instance, US Navy Hospital Corpsmen can end up on the frontlines with the Marines and are every bit as capable as they are when it comes to gettin' some.

After all, one of the rules of combat medicine is that return fire is the best kind of preventative medicine. If you can neutralize the threat, there's no need to expend resources trying to treat wounds.