Nah, we say someone got fired regardless of whether it was for cause or not. It's the go-to word for any kind of employer-initiated employment termination when you don't have to be nice about it. It's just that when someone was fired for stealing from the register, you're not going to be nice about it.

Those R&D folks who got laid off are going to go home and complain about getting fired. It doesn't imply it's their fault - it implies that they're angry about it.