You deny the concept of collective impact. One person using a plastic straw isn't a big deal. Three hundred million people using a few dozen straws per year is additive. Same with all disposables.

Furthermore, ocean pollution isn't the only kind. Look at any urban creek/bayou bank after a hard rain and look at the trash that is washed up in the grass.

The right-wing pejorative is "virtue-signalling" but is that always bad? Is it bad to set an example, a cultural marker, that we want to encourage re-use and biodegradable materials?

This is not an either-or.