If the truth contradicts deeply held beliefs that is too bad.
We do not consider patriotism desirable if it contradicts civilized behavior.
The new rage is to say that the government is the cause of all our problems and if only we had no government we'd have no problems. I can tell you that contradicts evidence history and common sense.
My background is basically scientific math. My Dad was a physicist so I have it in my blood somewhere. Scientific method is very important to me. I think anything that contradicts it is probably not true.
All anger is not sinful because some degree of it and on some occasions is inevitable. But it becomes sinful and contradicts the rule of Scripture when it is conceived upon slight and inadequate provocation and when it continues long.