I think it would be more fair to say that Lenovo's IdeaPad division had this unethical behavior. ThinkPad is a separate division that never did this.
I don't have any inside knowledge, but based on how it played out, Superfish and its ilk must have been a bright idea that came from the IdeaPad division, not something dictated by corporate.
I'm also a big ThinkPad fan, and I keep buying them regardless of what happened with IdeaPad. Of course you may choose differently.
I'm a huge thinkpad fan, but I won't be buying another one due to privacy and security concerns, and simply not trusting Lenovo.