> What, when it comes to corporations I can 'vote with my wallet'? I'm sure Apple, whose profits exceed those of some developed countries, will surely change their ways if I boycott them over stuff like the Uyghur slave shops.
Your argument is that voting with your wallet doesn't change things even if it reduces the profits of the company by an amount proportional to the number of people who do it, but voting in an election does where not only is your vote is still diluted by millions of other people, the result is all-or-nothing and the party/candidate doing the thing you didn't like can still retain full control of the government even after losing a couple percent of the vote?
It's the same problem in both cases. What you need is enough viable alternatives that you can pick the one doing the right thing instead of being given a fake choice between two or three "alternatives" that are all doing the wrong thing. And markets with hundreds of competitors are a lot more common than elections with hundreds of candidates/parties on the ballot.
One big thing you need a government to actually do is break up consolidated markets, and the current ones are evidently ineffective at it.