They are human, but they are not judges. When they act as judges, people have to spend eight years in federal court. [0] Much better for USPTO to let nearly everything through, trusting that most people are just trying to do business. When exceptions arise, they arise in the courts where they belong, but only after either A) someone infringes a valid trademark in some fashion that the courts can address and the holder decides that the courts should address that infringement or B) as in this case, frivolous dickheads decide to subject the public and the courts to some of their dickheaded frivolity.
You and I may have very different ideas about government. Do you support anti-BDS legislation? [1] Should people only speak the right speech, with the advance permission of the proper authorities? Fuck that, we have 1A for a reason. We have the right to say what we want and do business with whom we want. We also have the right not to speak and not to do business.
The entire concept of trademark is a creation of the state. If it no longer benefits the people, it should be fixed or eliminated. If cases like this were more common, I would support the latter alternative.
[0] https://www.ipwatchdog.com/2017/06/26/supreme-court-rocks-tr...
[1] https://www.bloomberg.com/opinion/articles/2019-02-06/anti-b...