There was probably a "golden age" in the middle of the last century when it was a good idea to be a company man. But before that, and after that once the MBA mentality took over, workers have been treated like disposable units.
It only makes sense for a worker to strategize to maximize their own career and income, instead of placing their loyalties in a company that not only doesn't care about them, but actively propagandizes in an attempt to make its workers feel like "family."