You are arguing that people should share your disdain for Musk's political views. You are not arguing against the claim that this is the only really strong reason why people would want to leave.
Second, libertarian ideals around free speech say that fairly engaging people whose views you disagree with is a better way to change minds than deplatforming them. That is because deplatforming them just encourages them to migrate to cesspools like Truth Social, which then become echo chambers for extremist views. Therefore there are reasons to allow offensive people to remain on a platform other than agreement with their offensive views.
Speaking personally, I am firmly of the belief that the obvious political censorship applied to social networks, including by the previous management of Twitter, is one of the CAUSES of the extremism that lead to the Jan 6 insurrection. You might dislike that there are people who think your children are a disease. But surely you'd dislike it rather more if we slid into an authoritarian dictatorship where people like that are the ones in charge. Therefore it is worth looking past your good reasons for taking offense, and asking seriously what is most likely to keep violent extremist networks forming that are in a position to do just that.
Note that multiple countries in Latin America copied the US Constitution's idea of separation of powers. A common pattern is that they wound up as authoritarian regimes after a powerful executive solved gridlock through declaring a state of emergency. It could happen here. In fact, it nearly did.
And finally, I find the comment that you're responding to far more in the best traditions of Hacker News than your reply. Hacker News has a tradition of polite and reasoned discussion of controversial positions between people of diverse points of view. I would rather keep that tradition alive, rather than implying that people who disagree with you are horrible people who might not mind your children being eradicated with fire.