Them having a platform is irrelevant. Trump is going to be the nominee, almost certainly even if he’s actually found guilty and ends up in prison (which I doubt will ever happen). This is all just a marketing exercise for the other candidates.
Also if they’re getting booed for denying climate change(?), then they’re better off just being silent on the campaign trail while continuing to support the oil sector once in office. Hell, they could even pivot to what the dems do by campaigning on it and doing nothing if their base starts to make it an issue.