Pat Buchanan is wrong about some things, but he's been right about others. When he's been right, he's been willing to tell some truths that make the average sheeple very uncomfortable. A personal attack against him is a bad thing because it makes one appear to be working out a grudge over some of the truth that he has told.
I know Robert Locke personally and like him. I attacked his ideas, not his person, in the above critique.
As for Pat Buchanan, I never met the man, and harbor no ill will toward him. However, his ideas are unsound. They cannot be embraced without employing Orwellian "doublethink" -- exactly as described above -- and I have noticed that every writer who contributes to the American Conservative quickly adopts Buchananite doublethink.
If pointing out this fact constitutes an unseemly "personal attack" in your mind, this would suggest that you consider Buchanan's core opinions sacrosanct and above criticism. Your discomfort with forthright discussion only deepens my impression that an oddly cult-like atmosphere prevails in the Buchananite camp.