Like the Tea Party, the alt-right includes anybody who considers himself so. Anybody who is fed up with establishment Republicans. Anybody who is fed up with “mainstream” conservatism like National Review.
The Tea Party was nice. The Tea Party was polite. The Tea Party attempted to be reasonable. The Tea Party was back-stabbed by it's allies (Mitch McConnell et al) and attacked relentlessly by the Media and the Left. (Same thing.)
It looks to me like the alt-right is the more vicious and confrontational response to the failures of the Tea Party to Accomplish anything.
Glenn Reynolds of "Instapundit" points out that we tried "nice" with Romney, and that didn't work, so now we are going to try mean with Trump, and see if that works.
If *that* doesn't work, we may have to escalate our methods of dealing with the leftists who monopolize the airwaves, and through them public policy.
As Glenn Reynolds has mentioned: "If you make peaceful revolution impossible, you make violent revolution inevitable."
The left needs to consider the "Alt-Right" as a shot across their bow.