I am curious, how do we prevent them from co-opting a symbol? This information could have saved Pepe.
The problem is that we're far too quick to associate two distinct things. For example, what do Pepe the Frog and the far-right have in common? ...nothing. It's not like Pepe was a character that espoused far-right ideology in the comic. In fact, the artist tried to have his work removed from that infamous InfoWars poster. Of course, that entire brouhaha actually just made the entire situation worse as you give the Internet an inch and they'll take a few lightyears. So, it went from Pepe being used in a poster to having tons of negative imagery created by third parties including a Hiter-like version of him. It wasn't that the cartoon character was bad.. it's that it became too toxic. If you Googled "Pepe the Frog", you'd likely find plenty of information on the controversy prior to ever finding the cartoon. Likewise, if you search up the Betsy Ross flag, you'll likely find a lot more talk of the negative controversy. I'd be surprised if said controversy would've even been on the first page in a Google search results prior to this event.
It gets even more awkward. For example, someone said that the OK hand gesture (pointer and thumb form an 'O', and raise the remaining fingers) was related to neo-nazis and Blizzard banned its use from the Overwatch League. The problem is that if these public-facing companies do not deal with these situations, it's easy for detractors to spin up negative stories, and even if they're not true, it doesn't matter. It all boils down to that it becomes searchable on the Internet, and that's all it takes. Imagine if Blizzard received a headline like "Overwatch League Allows Neo-Nazi Symbology During Events". I don't think I need to say that's not exactly what you want going around about your sponsor-based organization. (Note that Blizzard also bans the use of Pepe emotes, which was actually used on Twitch prior to being used in the poster. It's my guess that the Twitch use is likely what popularized it enough to get into the poster in the first place.)
So, until we stop taking the most drastic route and cutting off a limb due to a paper cut, I don't think it will ever stop.