The Ghallahorn is, what I've always referred it as, the Pikachu of Destiny. Everyone wanted one. Everyone gambled with RNGsus so hard for one. It was considered so prestigious that it wasn't even sold by Xur for a long time.
Those that did "earn" theirs by RNG have wielded these weapons with pride. They have excluded those that didn't have one. These people considered themselves higher than anyone else that didn't have one, giving them a false sense of superiority.
Now is the day, the weekend, that anyone can get one. Now anyone can be "special".
And when everyone is special, no one will be.
Now those that have been prideful of themselves will lose that sense that they have given themselves. That sense of superiority is no more to these people as now this exotic weapon is freely accessible to everyone this weekend.
So this is why being so prideful is bad. You raise yourselves high, just to fall down and get hurt in the end.
Let us hope this does not happen also in The Taken King. Let us hope that these people have learned from their sins and decide to not be this way in a video game. And let us hope for equality when the Taken Wars begin.