The more blatant they are in their partisan actions, the more they rile up the opposition and the more the pressure on lawmakers to repeal Section 230.
Once that happens, they get to have full control over the content on their platforms "because the law makes them liable", and they never have to worry about competition ever rising up against them ever again. They basically got to ride the coattails of Section 230 to the point of a monopoly; repealing it just gives them everything they want.
Ah whatever, censorship is not the answer in a free democracy. Freedom of speech has to be more than just a law written on some paper somewhere for it to mean something; it has to be something the people believe in their day-to-day interactions with their fellow countrymen. I suppose that's gone at this point...