If they want to run their racist mouth at work, they might be fired for it.
That's all we want. For people to be fired when they mouth-off racist views in the workplace.
Aka: being intolerant of intolerance. We can't be thought-police, no one has a mind-reading device. The best we can hope for is to kick people out when they demonstrate themselves to be an intolerant person.
I don't believe we are "at war" with white-nationalism. We are certainly not at the point where we should be imprisoning or killing people, yet. But I do believe we are at the point where we should seriously be considering to take down their websites and fire them from our workplaces.
The general hope is to clamp down on the philosophy and hamper them, so that this issue doesn't grow into an "open war" situation. One side has already demonstrated a willingness to spill blood on the matter, so we are marching closer and closer to violence on this issue.
There was a time when we could hope for better tolerance. But unfortunately, we're at the point where we need to be seriously considering our "strong soft-options": censorship, website bans, propaganda, infiltration / counter-intelligence, and spy-games, and other such tools.
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Ex: I HOPE we have tasked the FBI to infiltrate white-nationalist websites, not only to keep tabs on them but also maybe try to grow into leadership positions within white-nationalist groups. Full on infiltration / spy-games need to be going on (if they haven't happened already).
This is the least we can do in the wake of the El Paso shooter, especially since other political options (ex: background checks) seem out of reach.
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Note: Martin Luther King Jr. was subject to this kind of infiltration. This is literally the FBI's job: to infiltrate groups within the USA, keep tabs on influential figures who might be dangerous. Its unsavory, but only through infiltration can you figure out who is dangerous, and who is safe.
I still think racists deserve emergency medical care and effective fire departments, though.