Trim Stab, I don't think CM ever picked an argument with you. He just told you that you were wrong to take the debate in that direction at this stage. If he hadn't, I would have.
Yes, the decent is within the bounds of what little is know of his DA from the document you quote for reasons that have already been covered here.
You can be as interested as you like in any legal process, but going on line and saying you wonder if the pilot might be persecuted is rather like going to a F1 race and saying that you wonder if you might see someone crash - simply distasteful and pointless as you have already answered your own question. Investigations, Police, CPS. If you knew all that, why ask?