He is essentially fighting Hillary and the entire Establishment and people need to realize that and understand what he is up against and how rigged the entire system is. That’s why he talks about that as well as talking about how crooked HILLARY is and how she is part and parcel of that whole corrupt system.
Absolutely agree with you, but first things first. Focus on Hillary and win and then focus on your own party. When his message as broadcast by the media is on his own rants, then any message about Hillary is lost. He needs that free media because he is getting outspent on ads by a huge margin. Ads can be effective and carry your message, but if there are few ads, his every word uttered becomes very important.