I believe you are right and i would say more, if you have more than 20kg from your ideal weight then you have a health problem, period. You have more chance to heart desease, more chance to have diabetes, etc. Then don say you can be healthy and fat because it not true.
Also people say all women are beautiful, then ask: is your gf or wife fat or thin? probably thin and they say fat is ok because it is pollite to say that, but they dont mean that, so lets be true and honest, no one likes fat, rolls, double chin, etc. If people want to lie to themselves so ahead but I preffer to be truthful even if it is not pollite