There's an easy answer to this question my fellow empaths. For the same reason that you and I lie.
It's like when a friend asks you to go out to dinner and you don't want like hanging out with this friend or maybe even like them in general...but you would NEVER say that to their face....but instead of saying that, you say that you just want to stay home, or don't feel like going out.
That same night, you go out with a different friend and the aforementioned friend shows up. You've been caught. So you lie again and say that it just came up or you forgot that you had already made plans, etc etc. All to avoid hurting said person.
Maybe it's because you might want to hang out with this person at some point, so you don't want to completely burn the bridge. Or you just know it will genuinely hurt them to say that you don't enjoy their company so it's easier to just avoid the confrontation.
How is this any different than a Socio lying to you for the same reasons? True, they may not be entirely concerned about your feelings, but they do know that they exist, so if there's a chance they want you in the future for anything, they need to keep the peace.
Or we lie because we don't want to face the consequences of something. Let's say you steal money from your work because you need to pay your electric bill. It's not right, but you justify it because you have a legitimate need. And you get caught. I would venture to say that most of us would lie and say it was a mistake or come up with some other excuse why the money was missing.
Again, no different than a Socio stealing from you. We just justify things differently.
In many ways we are no different from an S...and yet so different.