Politics are at every show and with every human being. Deal with it or get out of the show ring. I do not like it any more than you do, but, it is hard to hire a judge that knows "everything about cattle", yet knows no one IN cattle. That is the nature of the cattle business.
I think a show manager should do everything possible to hire a judge that has no connections to any of the possible entries. It is really hard to do, with travel costing money, with limited show budgets, and the time it takes to research people that "no one knows". Possible, but tough to do.
If YOU were to select a judge, I am fairly confident that you would look for someone that "knows Simmentals and clubbies" and then the devon people would be complaining and crying foul.
Problem now is: If you do well, and the judge actually places you well, people will wonder how much it took to pay him off. Poor judge doesn't have much of a choice now does he?
Some advice from an oldie: Show to the best of your ability, present your animal the best you can, and be proud of the animal you show. Congratulate the winner. Smile and mean it. If possible, talk to the judge after the show and ask specifically what you could improve on. Learn. Do not stomp out of the ring, throw your show stick, curse, leave the ring early, or otherwise make yourself look like an ass. I have seen "adults" do that and lost any and all respect for them and their cattle operation.
Good luck and enjoy the day.