I think people are just saying Sam is suicidal to make Dean not look so bad for doing what he did.
Probably! Never underestimate the fans' ability to 'rationalise' away the things they don't like. LOL

I want Ezekiel to be shady because I fear they'll glorify Dean's decision otherwise.
Me, too. Although I am also torn about it. I mean, I really, really don't want Sam to suffer any more physical/mental harm or to be faced once again with massive guilt issues because his body was used to hurt other people. But I don't want Dean to get away with his reprehensible choice either. /sigh