Most recent studies of deep canvassing (redone to fix the fabricated data) indicate that a strong, empathetic listener with leading questions has only about a 10% success rate.

Note this is NOT shooting out facts, not necessarily a close individual who you've built repoire with, and in fact almost zero talking. AND it persists for at least 3 months!

It's small, but it's also viable and completely different than what most people I know think of when we go out to "change someone's mind."

Most likely at that point, they are making the opinion for themselves and you probably have very little in the decision making

>"The President is wrong and should be voted out of office" can turn into "The President is wrong and ought to be shot" in an echo chamber environment much faster if there's nobody around to say "wait, hold up, maybe don't."

Are you implying that social media created Donald Trump?

Milo was not the kind of agent that could change people's minds, except maybe those that already agreed with him.