Why are there so many "kkondaes" (condescending older people)?

Doing something kind for the elderly is not originally an obligation, so why do they make strange, "kkondae-like" remarks—not saying "if kindness continues, it's taken for granted," but rather that "you're taking away something you previously gave" when that kindness is stopped? (Kindness, by its nature, cannot be permanent)
I heard that this is why the free transit policy for seniors hasn't been revised yet...