They probably should though, at least I think so.
With mass layoffs of this scale, it seems like H1B roles should be the on the top of chopping block if we're keeping in the spirit of the actual purpose of the program. That means those H1B roles should have been so unique and world class talented that they were considered irreplaceable by the other thousands laid off. It seems they should be required to show justification this holds. It seems this should be pretty easy to provide evidence for if your holders are say Google Fellows (picking Google as an example) or the Peter Norvigs of the world.
I have nothing against H1B holders, I do however have a lot against businesses who often abuse these programs to suppress labor costs and dangle green cards as a piece of leverage. To be fair, big tech companies tend to be better about this and pay competitively for these roles though not always.