That link is full of screenshots of Kiwi Farms. Where exactly are the goalposts here?

The goalposts are a post on KF which advocates violence or doxing, was not mocked or deleted, and is still currently on KF - so screenshots of posts taken before they were mocked and/or deleted do not count (and it's quite possible any such screenshots in Keffals' possession were posted by Keffals or another affiliate and then snapped before they were mocked and/or deleted anyway).

Again, if this is such frequent behavior, you should be able to fire up a Tor browser, go to the site, and drop several links to such posts right now.

I see — the goalposts don’t exist. If there’s an eyewitness account, they could be lying. If there’s a screenshot of a deleted post, it could be fabricated. If it’s an active post, well, how do we know it’s not a fake post by someone trying to make Kiwi Farms look bad?

Make a snapchat like site where only terrorists post, and posts are erased after 2 hours. No harm no foul, since nothing is permanent?

Not sure where you're going with this since KF doesn't work this way.

Your argument was that since bad posts were eventually removed, the site itself was not advocating those things, sidestepping the issue of which people are drawn there and what the main use of the site is.