One things that separates the Alt Right from in the US the moribund and dying movement conservatives and libertarians is that we're willing to use any weapon the Left uses. That is, one thing that distinguishes us is that we refuse to play the game by the rules set for us by the other side, rules that ensure we lose.
So while we may find lies in the context of public discourse distasteful, they're certainly on the menu of tactics, although they're frankly weak sauce and hardly needed, like every other one of the Left's. The latter being a legitimate reason for the Left to be totally freaking out right now.
As for "unites or splits us", you're living in the past, we're split, ever increasingly during my entire lifetime (and I turn 56 RSN), can you honestly say there's any potential for this trend to not continue?
Put yourself in the shoes of the Right; what is the Left offering that would move us back "together" in some sense?
Let's call it out when we see it, leaving partisanship out if it as much as we can. This could be an issue that unites us, rather than splits us.
Something that makes this increasingly difficult is that we're having difficulty agreeing on shared truth. I think it's right to increase scrutiny on sources that are proving themselves untrustworthy, but we need to start trusting (and verifying) somewhere.