When I clicked on it, the page was full of Tweets don't fall inline with your claim, but maybe we all see a different Twitter according to "personalization" :)
If this was so prevalent, there would be many screenshots of the offending tweets used to prove that this hashtag was actually being used for making threats against Mike Pence.
Instead, all I have seen are screenshots of tweets discussing the chants made by the mobs who stormed the Capitol last week, as well as many tweets asking why this hashtag was there.
If can share some screenshots of a "page full of Tweets", or link to some evidence, then I will gladly take that onboard.