I keep wondering how Mark justifies this to himself.

Probably along the lines of "I'm Mark, why do I have to justify myself?"

I'm not sure justification has ever really been a problem for him. I assume this is a real quote from the early years:

Zuck: Yeah so if you ever need info about anyone at Harvard

Zuck: Just ask

Zuck: I have over 4,000 emails, pictures, addresses, SNS

[Redacted Friend's Name]: What? How'd you manage that one?

Zuck: People just submitted it.

Zuck: I don't know why.

Zuck: They "trust me"

Zuck: Dumb fucks

It's probably real, but we also don't know the full context. It could be a banter-y way of him introducing Facebook to a friend who hadn't heard of it, or something, and he could've just been kidding about actually giving information. Who knows for sure?

But knowing everything we know about Facebook now, it's probably more than likely true.

If he's a capitalist: $$$

If he's a true believer: "connecting people".

He's a narcissistic sociopath that has convinced hismelf he is making the world better, when all he is doing is polluting it.