It's simple: He's using it as cover by keeping a perpetual state of high security to hide the comings and goings of foreign diplomats he's making illegal back room deals with.
Traditionally, people notice when there's extra activity around the Whitehouse. By creating heavy security and a "green zone" around the Whitehouse, he doesn't need to increase security when someone like a Chinese diplomat or anyone else he's dealing with arrives through the tunnels to discuss the selling out of America.
After all, the Chinese aren't entirely stupid. They know you don't discuss the selling out of a country within its own borders without security assurances. So Biden keeps the security high 24/7 to obscure the timing of the meetings.
That's what this March 4th militia hoax is about. Biden is probably meeting with someone of particular importance, possibly even Xi himself. So he needs an excuse to up security to their satisfaction. Creating the militia lie just allows them to have a politically beneficial excuse.
They're not half the population. In some areas, possibly, the rest is fraud and propaganda. There is an average consensus what average people think about issues. Everything they're doing is to convince you otherwise. The average person, the majority, by far, doesn't want their taxes raised, or pay more for fuel and electricity.. The average person isn't a sycophantic leftist, but there are still millions of them, in a country with a population of 330 million. The average person is not even close to being okay with late term abortion, but those loud sycophant's are. Most people aren't okay with murder, rape, child molestation, but millions are in the US, tens of millions in my opinion.
Think of people's opinions on issues like language, the majority of people who speak english as a first language will use words they think the majority of people will understand. Trump for example, uses simple language so the majority of people know what he's saying, and they don't have to look at a dictionary to understand the context. But he's a very educated individual, has been around the best and brightest all his life, he can speak ALOT more eloquently if he wanted to, but he wants the majority, not the 5 percent of literature majors.