If it is just pro white nationalist, I dont have an issue since that is free speech, shitty free speech, but covered under the first amendment. A call to action on the other hand (like yelling fire in a movie theater, or a call to arms) is not covered, so it should be prosecuted to the full amount.
So gun laws dont stop the lawless you say, so you want more laws?
Red flag laws are persecuting a crime before they happen, as a co worker in some states I could call the cops on you, and they would search and seize your property without due process. Thats the issue, ala minority report.