> Or you can go work for a normal company that treats its employees well.
If a union is in the best interest of the employees, then it's in the best interest of any company that respects their employees. Companies which employ union-busting practices don't treat their employees well by definition. And promises of good will from management hardly compare to having a dedicated infrastructure in place to support employees' needs and rights, which is exactly what a union is. Management can change and promises can be broken. Unions on the other hand are intentionally structured to place employees' needs above all else.