Even on all known re-releases, we know that some Tom and Jerry episodes have been altered. And 2 episodes, even in their "complete set," are completely absent.
Those are good in a historical context to show just how racist cartoons can be, but certainly not for entertainment. Same goes for the early Tintin comics, especially those set in colonial Africa have serious racist undertones. Something even the author acknowledged. And those undertones are completely (?) absent from the later ones. Just shows how subversive racism can be when it is part of everyday culture, and that even non racist people fall prey to using those racist stereotypes in their work. The same goes for sexism and any other kind of systematic discrimination.
I'd like to quote the philosopher George Santayana, who I don't agree with that much but certainly agree with on this quote: “Those who cannot remember the past are condemned to repeat it.”
If we, to use the expression, whitewash all that happened in the past... we'll forget how terrible a place it used to be. So, I would agree that Tom and Jerry cartoons might not belong in a home audience - but that doesn't mean Warner should be incapable of, saying, releasing a true "for collectors" limited-release version of all the unedited shorts with a warning ahead of time.