Given that unionization efforts are bubbling up in so many different non-manufacturing corporations, the core reason isn't that workers are lazy. It is far less lazy to coordinate, organize, create and join something than do nothing. There is something very real going on with lower wage/entry level/lower skilled jobs that those who aren't feeling the struggle can't see.
Unions can help executives wake up to the issues while at the same time motivating them into taking subversive action. Greed is a powerful thing and unions cannot protect jobs in masse.
The big issue is at the very top, how money is distributed. No one is saying middle or lower incomes should get a handout, but a corrective action is needed to help more stake a claim in participating in the American dream. It is possible for companies to be extremely profitable while providing more for the economic needs of a society. The compensation ratios of executives, low corporate tax rates and the fraternity of financial bros between the Fed, Goldman and other heavy hitters is simply serving the interests of the few.
Anyways, since economic needs aren't being met, workers are unsure what to do and are hopping on the union train. It won't solve their problems but pyschologically it feels good to participate in something that gives the perception of having control. Fighting back is better than not and who knows, maybe positive change can occur with only the mention of unionization.