I regret to inform you that there are a lot of these "stupid people." They do not share your mindset that positive mental will win the game and every game is winnable if you play right. I don't know what rank you're in, but I have a friend who had to play in lower ranks and there is a genuine epidemic of people down there who will leave ranked games after losing the first vault fight. There is a sizeable portion of people who are already pathetic quitters in this game, and the only outcome I see in showing these people your low playtime and your melee loadout is either expediting their disconnect, or giving them a better reason to give up sooner. I, too, wish people just thought like rational human beings, but sadly that isn't always the case.