Miick-Talbot - re. your reference to being 'not especially bright' - of course I would not be so rude as to make that observation to someone in any walk of life.
But this is a debate about the concept of boxing, and it does not come down to personalities. My opinion that in order to want to participate in boxing as a profession, you may well lack an intuitive ability to see that what you are being paid to do is to hurt someone for eintertainment, and that is fundamentally wrong.
In my view, adding views like 'skill' and 'discipline' and 'sport' to this activity does nothing to escape the principle involved. You can excuse any violent behaviour under the premise of the skills involved in it. Fox hunting requires a high level of expertise in horsemanship, but the end result is to chase a fox to exhaustion and kill it, for the thrill of the chase alone.
Boxing is nasty, violent, dangerous, and sometimes fatal, and in the name of entertainment, I believe it has no more a place in modern society than bear baiting, or indeed foxhunting.