You have hit on something vital here.
There are do-ers and there are watchers, in real life and online. I consider myself a do-er. I've played a role, however small, on every campaign since Reagan's. Going to rallies, giving money, sending emails, volunteering at polling places, you name it. I've had the opportunity to meet many interesting people this way btw, including President Bush. Memories I cherish.
But most people don't put themselves out there, they just jawbone, in life and the cyberworld. Lots of opinions, sometimes very loud and adamant. But they don't do diddly.
You are right on the money - the vast majority sit and watch and act merely as "Monday morning quarterbacks".
Being negative is like frowning - it's easy because it takes less muscle than smiling - know what I mean?
Nice to see you're a player.