As others have already pointed out, you can literally get the same result by using images as quotes. People could've been shitty even without the quotation feature because it's not the feature on the platform that makes it shitty, it's the people on the platform who decide to use it for a shitty purpose.

Not implementing a feature because morons may abuse it is not justification for not implementing a feature. It's like saying we shouldn't be able to reply to comments because someone might use that feature to directly send you hateful comments. Now, if the features primary purpose is (or primary use case ends up being) to use it negatively, then sure it shouldn't be implemented. But I don't see how quotation falls under this exception. In my eyes quotation is a net positive.

It doesn't turn the platform shitty and if there are good moderators it also prevents assholes from trying to turn the platform shitty.