Because he thought he would get away with it. Why did he think that? Because he's a member of The Gang.
See my previous posts about the murder of LaVoy Finicum. Notice he won't be charged with attempted murder, but lying on his official statement. The narrator here couldn't tell the truth about the Finicum murder to save his life.
This young man did nothing more illegal than assert his rights.
They brought in a drug dog and it's handler got it to false alert. The cop doing the search says to his buddy, "He's perfectly innocent and he knows his rights..."