Because it's a silly topic. Why should there be luck in everything else but not in chess?
Because chess is a game of skill, unlike, say, darts, auto racing, and skeet.
I can't tell if you are being sarcastic. But if darts, auto racing and skeet are not games of skill then wouldn't all sports and many games (like checkers and soduko} also not be games of skill?
Because it's a silly topic. Why should there be luck in everything else but not in chess?
Because chess is a game of skill, unlike, say, darts, auto racing, and skeet.
To be fair, very few are talking about completely binary skill vs chance when they talk about difference between game of skill and game of chance. And in most cases it is a question of built in element of randomness instead of "well, I didn't eat breakfast and started lose my focus but I was lucky enough to find and threaten my opponents family the day before".