No, you don't need to care, because you are (as the rest of us are) a person speculating about it on the Internet. You are free to run riot with outrage, desire for retribution, and so on.
But, in the context of a proper enquiry into what went wrong, that's a luxury they cannot afford. If a structural aspect of these drivers' work lives turns out to have a bearing on their fitness to work, then before anyone starts getting into a frenzy of fingerpointing, that needs to be identified, and likely causes considered. So that - and maybe this is the crucial distinction - the system can be made safer and better so as to avoid more deaths and injuries, no matter who might be responsible.
But you're (hopefully, given how quickly you appear to have leaped to conclusions) not involved in the investigation, so are absolutely free to froth away to your heart's content. Fill yer boots