I'd need more information on how possible it even was to save the guy before drawing any conclusions on that one.
Not very possible if wearing 80lbs of body armor.
Or if you don't want to get wet.
I actually understand there could be several credible reasons for not trying to get that man. What I don't get is not only doing absolutely nothing, but also crap talking him and his lady while the dude is drowning. They don't have a rough ridin' rope in their car or radios to call rescue?