I don't think you quite understand how the unions work.
-in most cases, the employer is able to fire with cause. The union keeps the employer from using layoffs as a weapon.
- pay scales reward loyalty and keeps the workplace stable.
- without the union, you have almost no bargaining power. The union usually gets a better rate for everyone than any one person could have negotiated. This is in fact the point of collective bargaining. Even the presence of a union job site can lift wages across industries. I see this in Oshawa, where the CAW jobs making car bits helps waitresses and sales associates draw higher wages.
-the employer is rent-seeking on their capital. The union balances this.
-unions are not criminal organizations. The teamsters have done some things in the past. If we didn't have so much union busting, there would be more unions competing for workplaces, and this would drive bad unions out of business.
-unions are political, and need legal protections for workers. Tesla will eventually have to deal with a union or treat their workers better than the UAW.
-I don't like that the state grants asymmetric privileges to the employer class, like never prosecuting white collar crimes, and not clawing back exec severances during bankruptcy, and giving them a lower tax rate than their employees.
-there are many things wrong with policing in the us, but all could be fixed with fedral legislation. The unions are aligned with their membership, and doing great work. The wider outcomes are horrible, but that's a good union doing good work.