First, I will quote you Clarke's first law:
When an elderly famous scientist says something is possible, he is probably correct. When he says something is impossible, he is probably wrong.
Second, the reason they can only find one particle scientist who will say such things about string theory is that most particle physicists, even those who dislike the landscape, do not believe such things about string thoery. It's important not to conflate e.g. Susskind's claims for anthropism with proper string physics; Motl and Distler are just as critical of Susskind and Gross is.
Thirdly, I don't think anyone has a right to sneer at string physics unless they have some competence in it to indicate they might know what they're talking about. I have never seen such competence in your posts.