Imho it has got nothing to do with cowardice.
Elon Musk is a guy with a temperament, which can be a help and a hindrance. On the plus side, it seems to keep him on the edge and alert. On the minus side, it makes him do things by the Trump rule "twitter first, think later (if at all)".
Seriously, many others have said it, I will say it again: Elon has lawyers who can take care of any action that might be in order to be taken, if Elon really has undisputable evidence for what he claims. He doesn't need to, and imho shouldn't, personally put himself in such a dangerous position as to be attackable.
I can only iterate what happens over here, Tesla-wise: people don't see the benefits of the cars anymore, they see the irrationality of the man behind the company, some even seeing him as beginning to drift into madness. Not a good sign, and definitely not what Tesla needs at this crucial moment in time.
I think Elon should have really concentrated on what is important. From what I could gather from research, no one forced him to get involved.