It is justified, you've clearly never released a feature for anything to the masses.
The easiest solution is to have an "Okay/Cancel" box when you use this option.
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While you think it's funny, I find it abominable that you seem to either think it's ok, or just don't give damn. I'm not in shock that it's happening because it's the same in every MMO, not just FF:XI and FF:XIV. What does shock me is the game hasn't even been live for a week. Same thing happened in SWTOR, less than a week. I wouldn't mind it so much except they ruin the game community economy. People jack their prices up because they know some kid with a credit card will pay insane prices because they just bought their in game money from a website. That's probably the biggest reason I quit WoW. I did so much work trying to earn a flying mount and while other people just came in the game with a max level toon and flying around and wiping dungeon runs because they didn't have a clue how to play their role. Then later down the road when I decided to work a craft, I had to pay several gold to by materials only worth a few silver pieces. It got ridiculous.
Yikes, Camate. Might blacklist the wrong guy? Well, if that's all, I would suggest giving us the ability to right click the name, which would bring up a mini-menu that has the option to send a tell, add to party, send friend request, or add to blacklist. The blacklist option could have a big confirmation message that displays the name of the person being blacklisted, and the cursor could even start on the "Cancel" button.
For gamepad users, moving the cursor to the name of the person and pressing Square (X on xbox-style controller) would bring up the same mini-menu. This idea would utilize the same mini-menu that is used when targeting someone and pressing Square(X) and as such, you should be able to blacklist through this method as well, complete with said confirmation pop-up to ensure fewer mistake-blacklistings.
Definitely think that they need to crack down on this big time. One big thing that we have from the start that XI didn't have is a lot more bound gear. Gil selling destroyed the economy in XI. People selling items for many millions of Gil when there was no way to make that kind of money in a reasonable amount of time playing the game.
I had this problem in Neverwinter. They have a right click to report, and the chat was moving so fast you could have your mouse over the name to report and as soon as you click it was on a different name but you didn't see it quick enough, but clicked anyway. There was no confirmation box though, so... :\
It's interesting watching MMOs try and stop gold selling. It seems the harder it is to earn the gold for regular players, the more gold sellers. Just look at wow, it used to take forever to earn 40 gold for a mount, but now even for low levels it's easy, and in that time they starved the gold sellers. RMT will be huge here, i think, as once you finish the quests, there is terrible money making, and more spent than earn. 200 or so gil a leve, fate, dungeon run or whatever when a teleport costs twice that, not to mention repairs at 50?