I completely agree that lounges should be reserved for gold and platinum members that have earned their status and not upsold, and that those entering should be properly attired.
However, when traveling with my family, it is nice for all of us to use the lounge together. Perhaps the difference is that my daughter (9) and son (12) have been raised to exhibit good behavior in public settings and not run around unsupervised.
Personally, I am more irked by loud-talking, boisterous guests who have over imbibed and don't respect other guests or the lounge staff's attempts to maintain a more subdued atmosphere.
Some properties do restrict children under certain ages. One comes to mind, London's Renaissance at St. Pancras. The CL was very valuable to me on a recent stay in London where I had a chance to peacefully relax and visit with another MI.
Overall, I get my desired items and take them back to my room.
Thanks for your post samcoronado!