What do you think is the reason why anti-vaxxers have become so prominent recently?

It's just the media giving them more attention because it gets clicks and people share it on twitter thus more money for them.
They make money off dividing people.

Number one: this is a country with free speech. Number two: the education system is flawed. Same reason flat-earthers are on the rise

The media. Plain and simple. The media spreads the news and the copy cats follow.

Awakening

Media have decided it

when it comes to science most people are pretty stupid so they are easily led astray and social media has made it easier to spread misinformation.