They aren’t suicidal, they have different priorities. If Trump wins he becomes head of the party and cleans out the stables. They lose their power. If Hillary or some other Democrat wins they keep control of the Republican Party cash machine, and they can use the threat of Hillary and a Democrat run congress to blackmail conservatives into voting for them. Of course they would love to have one of their own who is dependent on the donor class win, but a Democrat is preferable to Trump.
They are suicidal. The base hates this type of game. Trump will now win hands down the rest of the states just to stick it to the GOPe. Trump would have worked with these guys.....that is choosing to die rather than work with someone who holds 90% of your views if not more liberal on some of them.