I still need to understand how the patent office can still validate such patent. I've read over and over that the patent system is bad, but isn't it just the p

I still need to understand how the patent office can still validate such patent. I've read over and over that the patent system is bad, but isn't it just the patent office being incompetent instead ? Isn't that rather an expertise problem ? Or are experts not even asked at all on those subjects ? Can't anybody sue the patent office for abusive patents ? Or is it just that the people at the patent office just depends on congress, thus making it biased ?