Biters are like insects and many insects work with scents.
Like "getting hurt" drops agggressive and fear scents on the ground.
So they run away when getting hurt and take their aggression with them which leads to bigger biters.
Full kill a attack wave would be better for your base
![Smile :)](./images/smilies/icon_e_smile.gif)
By taking some items from the death / run away bitters you should be able to invent scent towers, scent remove bits, a scent view goggle, trail markers, ... to manipulate the scent system (leading them to a hard defended point, avoid trainlines and small stations, ...)
So flooding your base with a "friendly scent" could lead to a coexistence by keeping them a little bit drugged
![Smile :)](./images/smilies/icon_e_smile.gif)