It’s an interesting moral philosophy: decorum is more valued than justice.
There is a third option, decorum and justice. Rhetoric without hyperbole. While the current environment does seem to reward those who yell loudest, that's a shame too, because often those who speak softly have the strongest arguments and information.
I try to imagine being there as the person to interview all involved. I would definitely be looking for all negligence and would be hard hitting with my questions and not accepting of excuses and untruths. On the other hand, I would also try to show my awareness and sympathy of what they've all been through, even those responsible.
You mentioned criminal charges which I stated in response to your question, I don't feel will be made. However, let's assume for a moment that negligent homicide was charged, which generally falls under some form of involuntary manslaughter. Could I not file that while also feeling tremendous sympathy for the one I'm charging? I would say the vast majority of negligent homicide cases are that way. Typically not bad people, not the type you generally think of as criminals, just people who through some horrible judgement caused others to die. Recently, I've seen several cases filed where a parent accidentally left a child in a car, forgot they were with them. It's a horrible conundrum because you can't ignore the crime but you know the parent is already going through hell. I would think everyone involved in this situation is being tormented today by the events.
Until evidence surfaces to tell me otherwise, I'm going to assume that many good people made some very bad decisions that led to this tragedy. It doesn't excuse any of those decisions, but it also is possible to sympathize with those who made them. Now, if evidence shows blatant and intentional disregard and forcing those who objected or going out against the objections of others, then that changes things a bit.
Now, I'm going to take your side a bit in saying I'm pleased to see some anger and outrage. I think when 17 innocent people die, it is appropriate. While I think you perhaps went a bit too far, I'd rather see that than the person who just says "s... happens". When interviewing persons for jobs, I use to ask them to tell me something that made them angry. I had one person say "I don't get angry. I don't allow anything to make me angry." I didn't hire him because I can't imagine being so desensitized that nothing angers us and there were things that he might observe in the course of his job, that if he did, I'd want him angry. Now I'd want him to express his anger properly, but I would want anger.
As to justice, an odd concept. There is nothing that will make justice out of this situation. You can't reverse what happened. I do hope that steps are taken to reduce the probability of a recurrence and that, at the very least, involves some penalties, financial or otherwise, on those responsible. I would think the strongest penalty, the feeling of guilt and remorse, is already impacting them.