Some of the posts here by amateurs are absolutely outrageous. It is a perfectly valid action for a Captain to go out and inspect the runway himself and assess according to the guidelines in his manuals whether an operation is viable. I have done it myself more than once and done several inspections to get the overall assessment of contamination, and found it acceptable, and had absolutely no problem. Aircraft performance tables include special contaminated runway data within strict guidelines.
I'm appalled at some of the uneducated and incorrect criticism of a pilot doing his job. The fact that most of the 'facts' in the original post are apparently incorrect is an indication of the validity of the criticism of the Captain! If there'd have been any hope of those posters being honorable and apologising for their criticism, I'd have demanded a retraction for the nonsense they've spouted! If you don't understand what you're talking about, why step in with dreadful criticism like that?