Do you want the US to subsidize shipping companies?
Absolutely not, if private business can do the job on its own. However, it is a better alternative than having a foreign government running our ports.
P&O was not state subsidized. Neither is Hutchinson-Whampoa or PSA or Maersk.
PSA is a Singapore state-run corporation:
"PSA is owned by Temasek Holdings, a Singapore government investment agency that already owns 4.1 per cent of P&O."