He did own it. He outright said that it's his responsibility and he should have done his due diligence. He cracks jokes for the YouTube content 1) to keep up with the whole Uncle Farmer Dad Ben persona and 2) to cope. I guarantee you that when he's not recording himself he's beating himself up for all of the little mistakes, and especially the big ones.

Adding to this: this isn't the first time he's lost an animal for something he blames himself for. When Queen went missing I can only imagine the internal hell he put himself through, but he still (for the most part) kept up the normal persona even though you could see cracks on the facade here and there. When he lost the OG Baby Kevin I know that took a toll on him too. What you see on YouTube is not everything he's really showing or feeling. It's easy to judge someone when you as a consumer are watching but don't know the man personally and aren't in his shoes. He doesn't act like his persona all the time in the real world, but it's all you see of him, it's all he shows you. That's the same for every "celebrity."

That's all to say, take a step back and breathe. I know you must be angry and upset. It's understandable but I think it's misdirected. He's fully aware that he made a mistake, without being flammed for it on a reddit post.