I played YMCA ball for 4 years during elementary, and I totally agree with you. Even in JH ball for my school we played with sportsmanship.
It was one game when is was in 8th grade (senior now) my team had 3 guys over 6’, and we were playing a team that had only a couple over 5’6", during most of the second half our coach made us keep one foot in the lane on defense at all times, which was very annoying, but it taught us a lot of discipline.
Now I am a starter on the Varsity team, and when we get a big lead, we don’t let down on the intensity, we still make good passes, fight for rebounds, and work out butts off, we just don’t make it a point to score every time we get a chance, we wait until we get the shot that we are looking for, but we never score for the sake of scoring, because even on the varsity level we have so much we still need to improve on.