You don't send an extermination team on all bears in a forest because some bears attacked humans that were passing by.
Well, the robots kinda saved Raune by keeping her in the lab for the past month then.
You do,though,when a particular bear has been killing people for months/years instead of staying away from humans,but usually just the lone bear.
Their loss of human fear is why things get dangerous,more so for them once the humans have had enough.
Whilst exterminating the masses is a good idea to keep things safe,so much so that it became one of the factors behind the lack of wolves and bears on the British Isles.
The mandrakes,though,were known by humans to be sentient,and are also known to have that vicious death scream,with negotiations not forthcoming.
That makes them even more dangerous for the humans.
Lone surviour seeking blood,has presumedly shed a lot of blood over the course of a few months/years,and now a famous researcher is amongst the dead,Jeff Bezos would be more then happy to send his Amazon Death Squad in.
Good thing our lil' robo quadruplets found her first.