It's murkier than that. There are some sects that won't kill mosquitos, because... "Thou SHALT NOT KILL", straight-up. Not "no killing your homies", not "no killing the humans", even, just "no kill" as an absolute: All are gods creations and to kill them is to desecrate god's works.
Meanwhile, the more militant Old Testament sects view it as "thou shalt not kill... humans who worship the same god as you in the specific same way as you that haven't broken any other rules of man or god, because after all, the bible's got the death penalty for basically everything, and we could use a bit more land, so that's all kosher".
There's a HUGE range in how such a simple rule is interpreted.
It's murkier than that. There are some sects that won't kill mosquitos, because... "Thou SHALT NOT KILL", straight-up. Not "no killing your homies", not "no killing the humans", even, just "no kill" as an absolute: All are gods creations and to kill them is to desecrate god's works.
Meanwhile, the more militant Old Testament sects view it as "thou shalt not kill... humans who worship the same god as you in the specific same way as you that haven't broken any other rules of man or god, because after all, the bible's got the death penalty for basically everything, and we could use a bit more land, so that's all kosher".
There's a HUGE range in how such a simple rule is interpreted.