It’s not “funny”. But to borrow your phrasing, it’s almost as though gun access, gun control, gun violence (and threats of violence), gun rights advocacy, and gun-related law enforcement were and continue to be racist, along with quite a lot of the rest of US policy and society. If you read (or even read about) the book you are lazily mischaracterizing you would see that the racism of gun control is discussed there at length.
There is indeed a consistent principle there – white supremacy (and more generally, rich straight white male supremacy). All of the rest – “public safety”, “free markets”, “job creation”, “economic growth”, “liberty”, “equality”, “patriotism”, “justice”, “respect for the law”, “meritocracy”, “republicanism”, “accountability”, “fiscal responsibility”, “originalism”, “family values”, “Christianity”, “truth”, etc. – are secondary, swappable, and dispensable smokescreens. At a glance these post-facto “principled” justifications seem contradictory and hypocritical, but that’s only for listeners who take any of them at face value.
Those who quick-change their claimed fundamental philosophical principles whenever convenient routinely turn around and (to use your term) smear anyone opposed to them.