It is generally harmful to a company's growth with a diminished trajectory if its employees unionize, so neutrality is a pretty generous move. I do fully support the rights of aggrieved workers to unionize for greater bargaining power to address those grievances but also of companies to do what they can to protect themselves against that.
A union, by its nature, is combative with the company where its people work. It's fundamentally a divisive organization, telling its members that "workers" and "managers" are different kinds of people, which is not necessarily true. Of course, poor management can create conditions like this too, which makes the employees want to unionize, and so they should in such a situation. From what I've read, the ABK workers appear to have been in such a situation, so I support their efforts.
What is less appropriate is when there is external pressure and sewing discontent to drive unionization among people who were previously mostly content with their working conditions (at no organization are 100% of the people at any level fully happy). This happens because the external union wants more leverage through increased membership. I have no sympathy for those unionization efforts, as they are far more destructive than helpful, like stock short sellers on the capital side.
Overall, I would prefer to see a more collaborative approach with fair management, a culture of caring for all team members, and a greater focus on co-ownership by all employees through stock plans so profits are shared and incent everyone to work together and row in the same direction for shared success. This drives all team members to work together to overcome shared obstacles instead of working against each other to extract the maximum possible concessions from their co-workers. Unlike unionization, these models also tend to change layoffs from the first cost-cutting move to one of the last.