Oh, I thought I was done with this thread, but ...
Why is it even preferable to make a child a prisoner of their stroller when they see everyone around them walking; or to hold a child by the hand for long periods, often raising their arm into an uncomfortable elevation rather than to use a safety lead? Elbow and shoulder injuries are common in emergency rooms in children pulled abruptly upwards by hand-holding parents. Handholding all day is far more frustrating to the young child than allowing them to experience just a modicum of independence toddling along on their own steam just a couple of feet ahead or beside you? Even the most attentive parent cannot guarantee that a zippy three year old couldn't dart into the crowd while the parent merely looks up to read a location sign or to make sure they are not about to be run over by the toontown trolley.
And howdy29, what you saw is not a factor of the safety leash, it is a parent who for some reason of her own which you do not know, was not attending to her child's actions at that time. The leash did not make her "lazy". Her frustration, or hurry, or poor parenting skills caused her to be inattentive when you saw her. What makes you think she would have been more responsive to the child if she had not used a leash?
I'm very glad for those folks who don't need the leads but that doesn't make them better parents. I have yet to hear anyone make a convincing argument for the harm that is done to children by being put on a safety lead. Perhaps to some adults the association with being "treated like a dog" is distasteful or degrading but that is not a child's eye view of the situation, it is an adult projection and has nothing to do with the developmental needs of the toddler.