Well- I check it. It is not FWE fault... well, may be partially.
And partially- MMM
Enemies too tough for the rangers
Forget about explosions, it is fake butaforia
But if ranger will be killed by mutants- quest will be falled.
So- we have two solution to the problem
1- cheat. Type in console TAI command, it will stop all from any motion (exept explosions, which don't kill anyone. Well- at least raiders.
Reach the raiders and kill all mutants. And all will be fine
2. Make rangers essential with the help of plugin
3. Make the rangers more tough