Extortion 17, Bengazi, Hillary's server & phones, Russiagate, Pelosi insider trading, rigged elections, & so many more!

Because the people in charge of investigating and arresting are deep state

The meme following your's explains it perfectly

Only they can be the accused and the investigators at the same time. It's like seeing the henhouse being wiped out in a gory fashion, the fox with feathers sticking out of his mouth, and the fox saying he'll investigate the massacre.