I still don't get what the problem is with claiming warranty on a second hand tool is.
Sears was originally paid full price for that tool, they accepted the risk that someday it might get returned under the lifetime warranty. Sears sold the lifetime warranty with that tool.
The problems I see are that if the replaced tools were originally stolen, so the warranty was never purchased. Second, the tools had already been exchanged and replaced, and were kept (or stolen) by a store employee, who then put then sold them at a yard sale, rather than destroying them... I see those as immoral acts, but as the purchaser, how do you verify the tool was not legitimately purchased?
Are the folks claiming it's immoral implying a lifetime warranty should not be transferable?