It plays into the roguelike angle. You're not supposed to be able to construct the perfect character. You're supposed to take what you can get and make do with it by buying what you need at the start and going as far as you can until you lose your character and have to start a new run.

At some point you can leave some items/gear to your next character in addition to getting items from the armory at the start with the new character (and using knowledge to increase their capabilities, but be smart about what knowledge to use).

aha i think i understood it.
so the game offers 3 random infected volunteers at start. you are just having bad luck. and it does not really matter, which one you will choose, its just flavor.