Every little bit might help in theory, but there's only so much "mind equity" or "confidence cache" that people have, to follow directives. So you have to make them count.
Focusing on the 1% instead of the 30% is not only minimally effective, but it's dangerous because it can exhaust your political capital and end up working against you.
We're seeing something similar in the case of Coronavirus. For example, telling people that ANY face covering can be used in a mandatory situation-- telling people to wear scarves-- is just effing stupid. It does no good at stopping droplets, and it makes people angry, so there's not even any marginal utility gained.
Instead, a focused effort should have been made months ago to tell people EXACTLY which face coverings are helpful, and then to PROVIDE those face coverings when possible. Scarves and loose bandannas and masks worn under the nose aren't doing shit, and some people are rebelling because they KNOW they don't do shit, to stop the spread of infection. It's not only pointless, it's dangerous and works counter to actual goals and real targets.