very true most fanciers used to get 12 to 15 rings very few birds were lost , but its win at all costs , and to have one or two members send 100 birds a week each is more common place , there bound to have a few in form with far greater losses , yes there are too many paper birds about , pedigrees were introduced to inflate prices and were far away from the working mans pocket , good birds win races better to have quality over quantity any day in my view. As you say if you have taken a bird up the road near its home and helped it on its way home on the day its raced then yes the rubber should be removed , but common sense would predict that a pigeon flying home would in most cases would beat a car.
A bird can make a mistake but more fault id lie at the fanciers door but you cant tell a bird is good enough untill its done what its been bred for and thats racing , are all stray bad ? read this
http://www.pigeonnetwork.com/articles/A_Wonderful_Stray.html