Again, it was a symbol adopted by them way before she ever spoke about it.
You're entire argument is based on revisionist history. And no, they wouldn't and couldn't do this for any other intellectual property that was being properly curated.
It's like you forget how long this went on before she talked about it, and how even Trump adopted it at one point when they made the meme about him. That same campaign adopted Milo to gather the flock. Brietbart doesn't need you or any Youtuber to cover their tracks. Meme culture is solely at fault. Meme culture takes down far greater than Pepe.
What Hillary did was merely throwing fuel on a flame to tell everyone that it's burning.
As much as Pepe was adopted by them, it wasn't exclusively and alt-right symbol until way after that point regardless. Hence the whole #savepepe stuff that happened.
It's an awfully ineffective method to not draw the distinction between "alt-right using Pepe" and "Pepe is an alt-right symbol".
But as for IP, I'm mentioning stuff that's int he public domain. And that much doesn't even matter. Like, dare I mention that Spiderman has a distinctive meaning on 4chan that is definitely way more prevalent than Pepe as an alt-right character ever was. If Spiderman was in public domain, you'd bet that you'd see t-shirts of that very meme out and about, and a public figure pointing that out and for an organisation to validify it would be all that we'd need to have that character as nothing else.
The fact is, after Pepe was being called out as a hate symbol, all that did was to increase the amount of alt-right Pepe memes.
I guess the crux of my point is that... Knowing what precedent that sets... If meme-culture is such an issue people should at least understand it to the point of not feeding into it ironically with criticism.
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#savepepe is taking whatever power the alt-right has gained from the whole stupidity away from them. I mean, there's always going to be something I guess.