Red states speculations about why things were omitted are just that. And since they're from Red State they are hopelessly biased speculations and NOT facts.
Don't waste my time with anything as basic and as widely discussed as this:
The indictment or criminal prosecution of a sitting President would unconstitutionally undermine the capacity of the executive branch to perform its constitutionally assigned functions.
The instances of obstruction of justice have been enumerated on this board repeatedly and the above guideline precludes indictment flor any of them, but NOT impeachment for any or all of them.
JR got a mulligan because Mueller thought he was an idiot who didn't know what he was doing.