Is there an alternative you'd recommend?

Not particularly. In this case it was more of a clarification of somebody else's words than my own opinion.

Public pressure works to an extent, but it's dangerous to use it, because if you can't get a sizable number of people to show up it signals weakness.

There's also the much more substantive consideration that "public pressure", in the shape of a rally like this one, only works at all if there's a credible threat of meaningful action if the presented demands aren't fulfilled. There being no chance of that here, the upcoming rally is little more than a chance for the soi-disant protesters to get out in the fresh air and reassure themselves that they're Doing Something Meaningful.

It's not just a rally, we're also arranging a citizen lobby day for constituents to meet with their representatives and talk to them about why this is important: https://rally.stopwatching.us/lobbyday.html

Oh, well, that's totally different, of course!

Acknowledgement of powerlessness and healthy disengagement in favor of more worthwhile ways of spending one's time. I appreciate it's not for everyone, but I have to say it's done wonders for my peace of mind.

I have a hard time imagining anything worthwhile that could come from powerlessness and disengagement.

No doubt. Consider, though, that only disengagement is a choice; whether or not you have power is not up to you. (You don't.)

That's it exactly.