Starbucks is their company. It could not exist without their labor. By unionizing, they obtain that power. You may feel different, but this is what labor regulations and the NLRB is for: to protect workers’ organization rights.
Starbucks belongs to its shareholders, end of story.
If unions hadn't seized political power to grant themselves unjust power these leeches, which is what they undoubtedly are, would be where they deserve, fired.
They are suppliers of labor, and should be treated like any other supplier of any other good or service, rather than being privileged by the force of law.
> Starbucks belongs to its shareholders, end of story.
Not even close. Workers have rights, among them the freedom of association up to and including forming associations centered around collective bargaining for better wages and working conditions.
It was through political power that the rights of shareholders were created as well. It’s just a legal construct after all. Are shareholders leaches too?