No, that's a myth. Look it up, fiduciary duty does not involve duty to maximize profits no matter what. There's no such law and the laws that exist give the management very wide leeway in how the company is managed, as long as it is not overtly subverting company's resources for one's own (or somebody else's own) benefit to the detriment of the company. As long as you have a plausible argument that it's for the good of the company, in a very wide understanding of it, it's fine with the law.