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this could personally devastating to folks because likes and retweets are viewed as endorsements (despite what some think)

Good. Maybe people should spend a moment figuring out whether the person they're retweeting is an asshole before giving power to their voice.

What if they're not an asshole but their account gets hacked by one?

Or it's a case of the worst person you know making an excellent point.

I'm not sure how this is good for Twitter, though, so not really a reason for them to implement editing.