I'm not sure that's a healthy approach though. For a few reasons:
1. The 1st Amendment
2. Not all conservatives are MAGA's
3. If you suppress a group, they're almost certainly going to realize they're being suppressed and that's going to engender even more anger, violent rhetoric, and radicalization.
That said, I don't claim to know what "The Answer" here is. Not entirely anyway. Not sure anybody does. :-(
In today, with internet anonymity and prevalence of entertainment, you have shit like Fox news, which is not a news organization but an entertainment organization, solely for the purpose of being able to tell lies and not get sued because its just "fiction".
2. If you are defining MAGA as Trump supporters sure, but the ones that identify as conservatives that don't support Trump enlarge still vote for Trump or anyone republican who supports/empowers trump, and they would love to see someone who is more competent and charismatic doing like getting rid of non white people in US just through less questionable means. Conservativism in itself a ideology stemming from insecurity. And the few things that conservatives get right (like gun control approach, economic policies) are all equally suppored by the moderate Biden/Kamala type democrats.
3. All you have to do is make it more expensive for them to follow their ideology than have a normal life where they can enjoy their vices. Nobody cares THAT much more about starting a civil war en large. You are not trying to erase them from existence, you pretty much just trying to lessen their outreach.