Why are Untradeable Mounts/Minions Lootable by Players that have them?

[Welsper59]

Well, that would just fall under verbal harassment in itself. The particular person I've seen do this already has multiple infractions on their account and is a well-known troll. I'd like nothing more to see them gone from the game TBH.

By all means, you should report it then. Multiple reports and offenses serve as evidence for a greater penalty usually.

can there be another intention of someone rolling on a Whistle of a horse they already have? there's absolutely nothing they can do with it other than throw it out.

Mistakes. I've done it with other stuff from time to time, which I'm sure most of us have at least encountered. I hit need/greed on accident just because I might not be paying attention to what it was I clicked and well... habit. Mind you, I think most of us would pay attention to certain items of rarity (like the mounts), but it can happen. Unfortunately, because of that possibility, unless they hint or say they're doing it to harass or it happens repeatedly, there's not much evidence to show that it was for reasons other than a mistake. Feel free to report, just in case this person has been reported multiple times by other people for the same offense (evidence of harassment attempts), but yeah... not much else you can do.