Because that's a coup. The idea that Trump wants to stay in office even if he loses isn't nonsensical, but the idea that he would be able to most definitely is. It's possible to envision a situation where a very contentious election is followed by Trump railing against voter fraud and stolen elections, leading to some protests and even a political assassination or two (patriot targeting traitorous liberals), but he can't just stay in office. It doesn't work that way. Even the most bootlicking GOP politician would be aware that supporting him in that would be actual, genuine treason, the consequences of which would at the very least kill their political careers, and more than likely see them all imprisoned.
In short: no.