It seems to me that it's irrelevant whether he means the anti-cycling rants he comes out with.
The fact is, there is a large chunk of knuckle-dragging mouth breathers who lap this stuff up. They'll be taking it completely seriously, and going "You're so right Jezza". And next time they get behind the wheel, at the back of their mind they'll remember Clarkson's tirade against cyclists, and be that little bit more dangerous around them. And that's why he should stop it.
However, his latest one about the strikers has been taken completely out of context and blown out of proprtion. I never trust headlines in isolation, so I watched the clip. He first said something broadly supportive of the strikes, and then said something like "But as this is the BBC, we need balance" and then made his execute them comment. He was trying (badly) to make a point about BBC balance and impartiality, and I don't see how anyone who saw it would think otherwise.
But I don't like him at all.