Because working hard on the production line means pay rises, rather than redundancies...
It's funny to see Americans fight against their own interests like this. We're talking about a country where nearly all of the increased productivity and wealth over the last few decades has accumulated with a sickeningly small percentage of the population.
Unions have been smashed, workers have seen their hours increased and their pay barely keep up with inflation, whilst the rich roll around in big piles of cash. This has left them with a crippled economy, soaring debts, and millions unemployed.
Then in their masses they visit Internet forums to tell us all how the problem is lazy workers not working hard enough for their corporate masters.
The kool-aid must be pretty strong over there.