I like the argument MacGyver gives regarding innocent people being shot in their own homes, beds, crossing the road etc.
I also like the argument he gives to Breeze when he's trying to get him to tell the police who shot the cop.. about the children of a mother who was shot thinking life isn't fair etc.
I think they put their "anti gun" perspective across quite well, leaving the viewer with something to think about.
Of coarse gun control is one of those topics where people don't try to see the others point of view, so the only viewers who will go away thinking about the messages of this episode are the ones who are all ready against guns.
I also like the quote from breeze in reference to what MacGyver was doing in the crate... "He's trying to get us out of here. Just relax, thats what he does."
I think that explains MacGyver so well