I don't have kids but if I did they'd be steered to touch rugby or ballroom dancing before 15s or 7s rugby. Hurts a bit to say it as I bled for the game growing up, but the cumulative risk of a permanent disability is not outweighed by the important benefits of the sport, namely fitness.
The social side of contributing to a club or team is trickier to replace, as it's still one of the unspoiled gems of rugby. Not sure you get that network of diverse individuals and families in a ballroom dancing studio...