I do anything I can to avoid throwing out a tool-- donate it, repurpose it, give it to a friend, whatever-- but not everyone thinks the same way. Maybe someone threw them out because "nobody will want these old pliers." Maybe they were turned away by their local Goodwill. I just tried to give away a small Craftsman wet/dry vac, in working order and with two replacement filters, and Goodwill refused. I didn't think it looked very beat up, but they felt they couldn't sell it. Fair enough-- I'll use it as a dust collector for my miter saw-- but almost anyone else would put it on the curb.
Not many people-- including people that use tools every day-- have the same appreciation for older tools that I see on this board. I personally get a great deal of satisfaction from refurbishing old tools, but that's just me. In any case, OP gets two pairs of pliers, and the pliers avoid being turned into roofing nails or washing machine parts. Win-win.