This is a problem from your government, by your government, that you voted for - one way or another. Pretending this problem is originating from anywhere else except the political choices you're making as a nation is denying reality.
But we cannot stop there, and needs ask why. There are structural forces that lead to this government, some of which are corporate. Fox and MSNBC exist to extract wealth from polarization, and have every incentive to drive wedges between us. Meta and X likewise get paid for optimizing engagement and hate drives engagement.
It's not all corporations, but they contribute to structural forces we're have to unwind as we also try to fix the government side too.