This discussion reminds me of playing a few weeks ago where I had to explain for 20 minutes why a hero can suck up damage for a squad done by a flame thrower. Trying to explain to the person that the damage is done the squad as a whole, not the individual members of the squad and because the hero is part of the squad they can absorb some of the damage (if not all of it).
After 20 minutes of trying to convince the person and even showing them the rules in the rule book, as well as the rules for snipers (being able to select members of a squad for damage), I had thought I had explained it well enough. The following week the same person still brought up the same argument claiming they couldn't understand the rule.
I guess some people have a problem understanding the context of a rule within the larger rule set.