Seems like it could be both, so I don't see the issue, "guest."
This is definitely something that needs to be worked on. Combining this with the "zeds can phase through walls" glitch and the game actually becomes annoying. Obviously this is still alpha, but it's a legitimate annoyance. I am unable to actually attempt to stealth around zombies in a town and be sneaky and pat myself on the back for getting in and out of a situation without triggering a zombie if the game doesn't act realistically to those movements.
My imagining for the game is that part of the experience in zombie survival is deciding exactly how to handle the undead. "Should I just kill this one zombie with my axe? Or might that trigger those two other zeds to attack as well?" "Maybe I should try to stealth into that cabin and then head out the back and circle around." "I could head into this building and pop that zed in the face; when the other three come over from the sound of the gunshot I can go out the side entrance and down this alley and avoid them." This should be how the game works, I feel. Survival and tactics to "beat" the undead. At the moment in this build it's more "I'll just walk toward this barn- oh look two zombies randomly running after me from three blocks away."