Sure, government should step in and require union formation. Either the employees join an existing union or are able to form their own, without any obstruction from the company. There is no case where the employees are better off without a union. It’s like going to court without a lawyer. Companies telling you, you don’t need a union is like a prosecutor telling a defendant they don’t need legal defense. Also, there is a collective element, the existence of non-unionized employees hurts the power of unions and unionized employees.