Well because it's true, not something we made up to make the Sanders supporters look bad.
Only 53% of Bernie Sanders supporters definitely "Will" vote for Biden, Warren, Buttigieg, Bloomberg, or Yang if Bernie Sanders does not get the nomination. Other then the now mostly off the radar Yang (who's supporters polled at a similar only 50% will definitely vote for another candidate) that number is massively outside the other candidates, which all range from 78% to 90% reporting that they definitely will vote for another candidate if their preferred choice doesn't get the nomination.
The evidence is on the side of the idea that Bernie Supporters are playing "My way or the highway" not us. Which is why it's so frustrating to keep having to stop the debate every other post to reaffirm
our loyalty to the "Orange Man Bad" ideal.
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https://www.newsweek.com/andrew-yan...r-nominee-democratic-unity-msnbc-poll-1485241