You see it a lot with everything. The $solution isn't perfect so it isn't worth doing at all. I'm thinking specifically of renewable resources here. "Solar doesn't cover 100% of our energy needs, so we'll just keep burning gas, and throwing some more coal on the pile".
A tiny bit better is still better, and it equals a lot when 350 million people make trivial changes. At that scale, it's no longer trivial, and can be further improved over time.