If you reprogrammed the turrets, then combat mode will initiate when you step into the map, and you won't be able to talk to anybody. In order to talk to them, you need to leave the turrets hostile towards you.
It is possible Vic is attacking you, because the turrets are inadvertedly attacking him (aiming for Horrigan, hitting Vic), you've left him, and they "represent you" somehow, I don't know why this is happening.*
In order to persuade them to join your cause, you need a whole lotta luck (not necesarily high statistic, just... personal luck in life!
) and high speech skill. Charisma should not matter much, because I am usually CH 4 or 5 when going there.
Either way, unless you've saved several steps of your progress in different slots, it seems you have taken on the full brunt of Horrigan, his guards AND Vic!
If you can, try to load a save where you did NOT re-program the turrets, and see if you are able to talk to them.
(Don't be too worried about the turrets. The only advantage they have is their number, as in, each turn there's a chance one of them gets a critical on you - which is the only way they'll ever damage you. Otherwise, they'll just tickle you and delay your efforts some)
*pure speculation on my part
I might also be wrong on some other details, but try without the turrets