Because they want everyone to use their name for it. Magats love that name. It hides what it really is and lends a celebratory air to the base at the same time as an intimidating effect to potential victims. Remember, they want people to 'self-deport' and this is part of that strategy, in addition to its obvious use. So they're going to make more places like this with more names like this.
Don't help them. Don't go along with what they want. Resist them in every way possible, including not using their terminology--whether it's what they call concentration camps or what they call the bills they pass, like the huge hideous bill signed yesterday.
Even though two parties is the equilibrium state that's always reached, a new party can replace one of the two if it has massive enough support (the other method is for a contingent faction to take over one of the existing two as we saw with maga). In our system, having it funded by the richest person in the world who also has a large following already is one of the few ways a new party could feasibly get to that level.