If this were a vacuum then the Presidential action to save the Carrier jobs was solidly well done. But it's not. By extending the benefits to Carrier makes them more competitive, relative to Dunkirk, Burnham, Peerless, etc. What happens when Carrier's special privileges mean lost sales at the other boiler companies and they have to lay people off.
That's why it's a very dangerous precedent for the Executive to set, because it inserts him into the marketplace where he decides on the winners & the losers. That has never, ever worked out well, and is the perfect definition of crony capitalism.