How can you say something like that? What does "oppose" mean to you exactly? Being the leader of a 1 million-strong protest group? If so, then yeah, I would expect such people to be very careful about how they protest online.
But everyone else? Come on. Most people, even most dissidents, are not tech-savvy. There even was a recent story about NYT whistleblowers sending classified data to NYT via WhatsApp, without ever making the connection that their phone number used in WhatsApp could be linked to them.
The vast majority of people aren't infosec experts.