Ben snaps in the van as Sun and Jack discuss Jin

As Ben is driving Sun and Jack to the church where he has promised Sun proof that Jin is alive, Jack apologizes to Sun for leaving Jin behind. Sun wants to know if Jack is apologizing so she won't kill Ben if he is lying about Jin, but Jack says that he'll kill Ben himself after what he did to Kate. That's when Ben snaps and brings the van to a screeching halt. Ben says "If you had any idea what I've had to do to keep you safe, to keep your friends safe, you'd never stop thanking me!" He then tells Sun to shoot him if she wants but she tells him to drive.

This is another moment where we see Ben snap and they have been few and far between. These moments really seem to be the only ones where it seems that you can truly believe what he says. So with that in mind, what exactly has he been doing to keep the Oceanic 6 and their friends safe?