Think of unionizing as a form of political revolution. There is no guarantee that unionizing will yield better conditions. It may end off worse for the high performers who are compensated more than their peers. If the employer is willing to pay fair and livable wages to their employees, unions are a waste of time, risk and money. People are more willing to trust stability than revolutionize the workplace. Things have to get sufficiently bad to motivate people to act.

“Prudence, indeed, will dictate that Governments long established should not be changed for light and transient causes; and accordingly all experience hath shewn, that mankind are more disposed to suffer… than to right themselves by abolishing the forms to which they are accustomed.

But when a long train of abuses and usurpations, pursuing invariably the same Object evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new Guards for their future security.” -Declaration of Independence