No matter what other harm Trump does, withdrawing from the TPP will be a very good thing for the US.

It was already unofficially dead, but this puts the spike in its heart.

On balance, I think relatively-open trade is a good thing; however, the TPP was a deal negotiated in secret by large corporations, with overreaching and onerous copyright restrictions, little to no protection of worker rights, and was mostly a racket to protect corporations from competition and lawsuits, even above the power of sovereign nations.

It is a very, very good thing that it is dead.