The parent comment isn't about dual-class companies, it's about the fact that many shareholders effectively don't get a choice in how the votes for their shares are cost.

Exactly.

I'm not against forbidding index/401K funds from investing in those companies since many people (including you) deem those companies as "bad".

Many average people don't actively manage their funds. They would've missed out on the benefits, but that's okay. Having shareholder voting power is more important for them, I suppose. While I disagree, I might have voted for it. Because this would've translated to less competition for house and stuff.