Well wasting food is not good, but so is wasting time, effort, and more good food trying to avoid waste.
For example bought some swordfish that was absolutely horrible. It wasn't spoilt, did not smell off, but it didn't cook correctly and neither the taste or texture was acceptable. Being a life long fisher of both fresh and salt I am fussy. And truthfully we don't eat leftovers for dinner, lunch yes, but not dinner.
My buddy (of Scottish decent) whom was staying w us wanted to try to salvage it for another meal. I told him point blank neither my wife nor me would be eating whatever he cobbled together and please feed the fish to the coyotes. Thankfully he got the msg, coyotes and magpies were happy though!