Employers are about profit, NOT the interest of workers. Workers have to advocate for better working conditions, fair wages and benefits.
Collective bargaining allows workers to have strength to match corporate power. Unions represent the only organized check on business in the US.
Answer this. If an employer is offering something less than acceptable for a worker, why would they go to work there? Also what gives an employee the right to demand a change to the employment contract after accepting the terms in the first place?