I do not understand the comment about his not having credibility to burn. Opinion columnists aren't jockeying to run for class president. They're supposed to take various opinions in order for ideas to be more fully fleshed out.
If the only purpose of the opinion section is to say things that reflect well on you or cover you in glory, we can pretty much skip the entire exercise and just lay-off all these people right now.
It's odd, and I don't direct this at you, but for some crazy reason people think that they should like all of the opinions that various press outlets run. I wonder if they have any idea the various opinions places like the NYTs have allowed folks to express, and quite rightly, too. When I have to like or agree with an opinion columnist, I'm missing something about where the value in the transaction is. I already know what I like and believe in. I don't need to read it over and over again.