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IMO, "Like" is just one of the ways for users to express themselves, you remove this tool, they'll find other ways, e.g., flood with one-word replies.

Account with huge number of followers that can block counter accounts could create an echo chamber, which is rather poisonous to a healthy debate.

That being said, I don't think twitter should be used as an debate platform, and there are some online tools trying to solve the problem already, like Kialo. They perhaps are not good enough, but still better than twitter.