His rallies, now especially, are mainly for a TV audience. If he is catering to a tv audience he may as well go where his support is the strongest and huge numbers of people show up. That’s great tv, great Instagram, twitter, facebook, youtube.. He is a master of the media.
You really get it.
In addition, Oklahoma is one of the 8 states that never had statewide lockdowns at all. In addition to having some of the lowest coronavirus infection and death rates.
Not to mention far less riots and looting than these deep blue states.
Its perfect for this purpose.