Even in the absence of a moral obligation, saving a drowning child to whom you are not otherwise connected (or getting first aid training in anticipation of such an opportunity, etc.) might still be a very worthwhile investment, with the right follow-up. In addition to broader reputational effects, there’s the possibility of a debt of gratitude from the child and any associated parents or guardians which would broaden and diversify your social circle, without giving those approached an opportunity to resent the intrusion.
Even in the absence of a moral obligation, saving a drowning child to whom you are not otherwise connected (or getting first aid training in anticipation of such an opportunity, etc.) might still be a very worthwhile investment, with the right follow-up. In addition to broader reputational effects, there’s the possibility of a debt of gratitude from the child and any associated parents or guardians which would broaden and diversify your social circle, without giving those approached an opportunity to resent the intrusion.