Ultimately, it doesn't matter whether he was "right" or "wrong" (insofar as those are even meaningful adjectives when your plane might be on fire.) What matters is that he was the PIC, and determined that it was time to evacuate. End of meaningful discussion. If we let this sort of second-guessing go on, it's not just bad for "us", it's bad for our passengers. The Feds famously have a "dual-mandate", in the US. That leaves the Pilots to be the ultimate advocates for Safety. We let this guy get cashiered for making a command decision, we've basically given up any meaningful authority on our own aircraft, forever. And they won't be giving it back out of the goodness of their hearts.