If Risk isn't a great game, then why do people playing it get so angry when they start to lose? There is something about Risk that makes players get emotional

If Risk isn't a great game, then why do people playing it get so angry when they start to lose? There is something about Risk that makes players get emotionally invested in a way I just haven't seen in other board games. In most other games I don't care if I win or lose. This is doubly true in the sort of board games my board game 'aficionado' friends play. In those, there are often multiple different ways to win and everybody might have their own unique win condition, that may not be known to other players. I guess this sort of design is meant to minimize conflict. But the way these games minimize conflict seems to be by making people care less about winning.