Less intense word for activist

The word activist means "a person who campaigns to bring about political or social change.".

I'm looking for a similar word but one that is less intense. By that mean, a word that refers to someone that is not really an activist, as the word commonly refers to, but nevertheless consistently exhibits political expressions that indicates their subtle desire (if not active acts of activism) to effect social change.

This could be a person on Twitter tweeting about whatever ideology without (necessarily) being directly involved in any organization acts.

There is "SJW" (social justice warrior), but the word I'm looking for is not tied to any particular ideology. It could refer anyone from a keyboard warrior SJW to an anti-feminist person; anyone invested in some sort of 'social change' at all, not matter how 'right' and 'sensible' they are.

Example sentence:

• Unlike you, John does not pay lip service to the social protocols. He is a ____, who must constantly express his opinions over how society ought to be. You are a realist, and go along with social protocols; he on the other hand has taken a stance and desires a need to change those protocols.

Devotee, disciple, adherent, follower and practitioner come to mind as I look into words like partisan. These seem to largely espouse the belief without necessarily evangelizing it to some degree.

In the event it helps you with ideas, I'll add that sympathizer was an earlier word I considered. It, too, tended to be more active in its connotations.

Supporter would be the best word for what you are looking for. While an activist directly seeks change, a supporter simply desires at and may make some action towards it but not as much as an activist.

"A person who approves of and encourages someone or something (typically a public figure, a movement or party, or a policy)." https://www.lexico.com/en/definition/supporter

If you are not an all-out activist, you might be a simple advocate:

[Merriam-Webster]
2 : one who defends or maintains a cause or proposal
// an advocate of liberal arts education
3 : one who supports or promotes the interests of a cause or group
// a consumer advocate
// an advocate for women's health

An advocate can be someone who simply expresses a positive opinion about something, not necessarily someone who rallies for it.