What Musks see that most people don't is that numbers matter.
If you have a platform which concentrates one part of the political spectrum, either left or right, you are not touching everyone. Currently, Twitter seems to be more left-biased than right-biased (seeing that they did censor information reported by a major journal, the New York Times, when they reported information that was 100 % factual - censoring one of the major press in the USA is a huge, huge mistake).
Musks wants a platform, and he said it clearly, for MARKETING.
He wants a platform with both left and right oriented people.
Sure... those two factions in the USA are gonna wage war online, but meanwhile, Musks will be able to push MARKETING to both sides because BOTH sides will be online on that platform.
He wants both "factions" from opposite sides of the political spectrum to be online in the same agora. So he can then market those audiences to the groups that want to push marketing there.
He wants to do with Twitter what Google has become : first, and foremost, a marketing company.
Google is not about search. It is about marketing :
He's stating his point of view clearly.
He wants everyone in that platform.
And he will use the law of each country to find out what can be allowed, and what has to be removed, country by country (which is going to be a little weird, because some countries will accept content that other countries will not, and Twitter is a global Internet platform).
People will fight online, and on each sides we'll have people freaking out. For sure.
But Musk will be able to market to everyone at the same time by avoiding the platform to be either an echo chamber for the left, or the right.
He's looking beyond the political divide and will try to replicate what made Google so powerful and rich : turn the company into a marketing tool.