My work is related to the construction industry. Construction jobs are good -- far better than no jobs at all -- but they tend to be seasonal in many parts of the country (they don't pour concrete or lay asphalt in the northern states, steel workers generally don't erect steel when it's freezing cold and slippery up there, and any number of other trades come to a screeching halt when the first snow flies).
And then there's the fact that construction is inherently (relatively) short term. Say you're building a widget factory. It probably takes about a year to build a factory -- and virtually no trade will be on the site for more than half that time. Once the widget factory is done, unless there's another project starting up somewhere in the region, all those construction workers get laid off. But the people who make widgets can run the factory for fifty years -- as long as people are buying widgets.
So, yes -- construction jobs are good, but good old Made in the USA widget jobs are better.