I have a bit of a different take on the right's isolationist bent. It's not that there isn't one, but it's half a lie. Except for an infinitesimally small minority, those same "isolationists" fully supported the Afghanistan and Iraq wars until it became clear how badly things were going. They would gladly send American troops all over the world to slaughter millions of people.
Many of those "isolationists" on the right would love for American troops to have behaved in Afghanistan and Iraq like Russian troops are behaving in Ukraine, and they would love to see us turn Iran into glass. What they oppose is "nation building," using American troops to help build up and protect friendly governments overseas. They don't realize that the whole point of that is to benefit American businesses. There are extremely valid critiques of using US forces for this purpose, but right-wing isolationists don't share those critiques, they think it's either misguided liberal altruism or Jewish conspiracies to undermine the American volk.
They're not really isolationist, they just disagree with what they think is the purpose of most US foreign policy as enacted by whatever they see as the establishment (usually Jews). The only thing they would support more enthusiastically than some truly barbaric attacks on foreign countries is using American troops to commit barbaric attacks on their political opponents here at home.