Because America is the most powerful and influential nation on the planet. And because America polarizes everything and acts in extremes. It's always all or nothing with those people.
the USA has had an establish status quo and it's being absolutely oblitorated by a newcomer who doesnt play by the rules. And they're going full damage control or in the offense. Everything, every outlet, every forum, every kind of media is now a tool to fight and preserve the status quo.
And as the status quo is being shattered in the USA, so is it being shattered in everyone influenced by the USA. As in everyone consuming US media. Which is everyone.
Politics in a democracy cant exist if there is no open discussion. Thats why freedom of speech, anonimity and actual conversation are so important.
As, of all people, Hideo Kojima (and I dont doubt many more did) predicted though, people retreat into their own little bubbles, their safe spaces, their echo chambers to just get everything they've held true confirmed. More interested in circlejerking than in having a discussion and being proven wrong.
I like to ask people why they think something. it doesnt explicitly say you disagree but it helps people reach a revelation on their own sometimes.