Save. Talk to the scientist. The a**hole is convinced that everyone
on the mainland MUST be mutants and must be exterminated, even though
he didn't bother examining their DNA. Try to BS him. Convince him
that since his mutated FEV only works on humans, the "mutants" on the
main land (a.k.a. human survivors) must be just another kind of human.
Give him time to think. He'll suicide, together with the base, by
releasing the FEV tanks into the air. If it doesn't work, you can
reload and try again. This doesn't seem to affect you, your group,
the president, nor any Enclave troopers in power armours, but (slowly)
gets rid of civilians. Can't say it helped me too much, though.

Go to the next level, and waste everyone here, too. Heal yourself and
everyone to full health NOW, and save. Put an explosive next to the
reactor's computer. That's the big mainframe. Watch the computer go
boom, and the reactor go critical, just as that downloaded report
said. Hurry upstairs, using the alternate stairs whose doors have
just opened on the "president's" level. This bypasses a couple of
levels (including the electrified maze), and saves you a little time.

On the first floor, guess who's waiting for you? Yup, that big mutant
Santa in a modified Advanced Power Armour, and his elves. The goon
squad who've been walking around killing people all over the desert,
including the deathclaws in Vault 13, and capturing people for their
gas chamber experiments. Go use the terminal in that room, and
activate the counter-insurgency option. (You did bring along the
"president's" key, right?) This activates all those turrets in the
room to fire at him. If nothing else, they should keep him distracted
while you do the job with your Bozar, Vindicator minigun, or whatever
weapon you still have ammo for.
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