Who says they supported Trump in the first place? Business 101 teaches that a stable, predictable market is good for business. First go-round was bad enough, but this time Trump campaigned on massive tariffs. And again, they knew damned well that would be bad for the economy.
If my dumbass knows all this, I can hardly imagine a top-level CEO would not. Small-time CEOs can be dipshits, but stupid CEOs are rare at major companies. We just don't hear about regular competency because it's only news when they say or do something wildly stupid.