They're fairly easy to remediate, but the fear will remain long after the radiological threat passes. Look at all the people still wearing masks, even when they're outside/in their car, alone. Some people just don't know when to stop being afraid.
I mean, it doesn't matter if its easy. You'll cause mass panic and massive economic damage. Even if it takes two days, the economic damage will last longer as well as the fear and conspiracy theories that will pop up from it. From that standpoint, it really is a perfect terrorist weapon. Because long after the bomb detonated, people will be paranoid about the area and won't believe the government or the media about it. So the long lasting effects will be there. And if it is as powerful as a conventional bomb, it will still cause a lot of casualties possibly.
And suitcase nukes are actually real:
https://en.wikipedia.org/wiki/Special_Atomic_Demolition_Munition
But unless you're an advanced nuclear power like the US, Russia or China, you're not going to hand those out to terrorists.
Whenever I read posts that claim that ordinary citizens have no chance in a fight against the US govt I think back to those videos by Deviant Ollam on how easy it is to get into supposedly secure buildings (deadbolt attack to get into a water treatment facility came to mind). Then I remember that critical pieces of infrastructure are protected by the same caliber of security.
The problem is that the fight against the government relies on every single police force, national guard unit and military unit to be unanimous in fighting the citizenry. If it is a righteous cause, its not going to happen. You will get police and military sympathetic to the cause and it is utterly impossible to protect every piece of infrastructure from a domestic insurrection. It'd be an absolute fucking nightmare for the US to fight a domestic uprising. The amount of space, the vulnerability of our infrastructure from within is insane. You don't need nukes or F-15s to fight the government.
Fuck, insurgents won wars simply by using technicals: rapidly easily deployable trucks that hit hard and fast and then disappeared into the night. Biden is a blithering retard. The Second Amendment works because it makes the government (unless it has gone totally bugfuck out of its mind, which is another problem altogether) paranoid about actually fighting its citizenry. Shit, drones won't help when you've got thousands upon thousands upon thousands of rough mountains, forests and even cities: Insurgents using sewer systems to pop out and do guerilla strikes and meet in basements. Or in subways or tunnels.
What, you're going to collapse the subway and sewer system of a major city that you control? Yeah, I don't think so. Sending special forces down into that is a tactical fucking nightmare and it would be booby trapped to hell and back.
Believe me, the government does not want an insurrection on its hands. Biden is blitheringly retarded as well as senile. Nobody believes him when he says 'guns are the problem'. No, they're not. Police actually need more funding. You could separate police and train certain units for certain calls if you wanted a less violent approach. You don't need to have them be militant, but you can't cut back on them either and be at odds with them, because without them, you get what is happening now. Its hard to ignore that crime is going up in Democratic cities. Like those people brutally executed on a fucking city street in Chicago among half a dozen bystanders or those fucking retards twerking at the EMS unit. Your city is a fucking disgrace and you are to blame.