Do I disagree with the Dr. Seuss delisting? Yes. Do I think government regulations would be more harmful than helpful in this case? Yes.
If eBay was a monopoly, I'd be much more concerned (all the more reason for robust anti-trust legislation). But in practice, if you want to sell a Dr. Seuss book, take your business elsewhere.
Similarly, today we can look at what's happening and say "Hey this isn't great that businesses are allowed to restrict our speech and narrow down the realm of ideas to the least common denominator. It is destructive to the public discourse that a small group of people can claim outrage and shut down whoever they want", so we can decide not to let businesses do that, just like we decided not to let them refuse service to protected groups.
Yes, exactly like if the shareholders, board, and employees didn't want to do business with Black people, the government forces them to do so anyway. It absolutely boggles the mind that the justification comes down to "well, some people don't want to do that". Tough shit! If you don't want to deal with all kinds of people from all walks of life with all kinds of backgrounds and opinions, don't run a public-facing business.