Should a pilot be fired  

The correct answer is "it depends."  As one poster said, the "I" could be for "Intentional," not "Inadvertant."  In that case, then "it depends."  Was it arrogance, stupidity or a calculated decision?  Arrogance or stupidity?  Absoulotely YES!  A calculated decision?  "It depends."  Why was that decision made?  Was it the best option?  You get the point.

Once many moons ago, I was in an AMRM class for one of the major HAA players.  There were pilots, medical folks and mechanics in the class.  The instructor was making the point to the medical folks that IIMC was, by definition, an "emergency" because we were a VFR program, but that it wasn't a "death sentence," because all the pilots were instrument rated and knew how to handle the problem.  One of the longer time pilots in  the program took offense to that position and told the instructor he was "minimizing" the situation.  The instructor asked the pilot if he had "ever been IIMC before," and the pilot said, and I quote him verbatum, "yeah, a dozen times!"  Folks, I submit to you that pilot was part of the problem!

BTW, a few months later, that same pilot went IMC in a dust cloud while trying to land on a scene call and dumped the collective.  He landed so hard it spread the rear crosstube and wrinkled the tailboom at the attachment point.  He actually had to be told the aircraft was damaged and to shut down!