Why are you trashing the American company already? They haven't even announced who's taking over the contract.
It is a gneralised business analysis. If a US company already knew it could run these ports more efficiently than DP World, they would have made a bid for this part of the business because they could outbid the DP world and still make money.
That's how business transactions generally work. Each company makes a decision about how they can run the business.
We know that P&O was selling because their current management was unwilling or unable to spend the money nececssary to fix up the ports (things like improving the fences around the facilities).
But it is possible that some U.S. company can be "persuaded" to reconsider this deal, and that company can actually be able to handle the deal.
I think the same people will run the ports in any case.
It is certainly better for us that DP World is doing this voluntarily, rather than have a law. The law would have not been efficient, and would have had bad side effects.
So I will say I am cautiously considering whether the end result will be as good as it would have been with DP World. I will close by saying that in general, being part of a larger organization does seem to make for more efficiencies and better operations -- or else everything wouldn't tend to large companies.