I think a lot of us would feel this way whether it was a star of J@ck@ss who did this or one of the stars from your typical sitcom or tv drama.
The guy drove drunk (and had a lengthy history of various traffic violations) and killed himself and someone else. Only by the sheer grace of God did he not take out anyone else. So yeah, I'd feel the same about anyone who did that.
I'm not saying that his friends, family, co-workers, etc, aren't entitled to their grief. They most definitely are. But when you are Bam Magera, who has made a career and a ton of money on the shtick of acting outside the bounds of propriety (seriously, from the 15 minutes I watched of his own show, not the "donkey" show, I wondered why his parents didn't disown himi for being so hateful), then you have no business pitching a fit when someone else does something that you don't find proper.
And honestly, I still don't think Ebert said anything wrong. This guy had 23 driving citations, including a former DUI. He had been drinking, and drinking hard, with other people. He chose to get behind the wheel and ultimately took 2 lives. It could have been a lot more. A lot of people along the way had the chance to intervene (or at least try to) and prevent this, and they didn't. I don't think what amounts to a PSA about that is inappropriate.