Take for example a school project...if the group is graded based on everyone's contribution, but you've got one person who contributes nothing or actually makes it harder for the others to contribute. The person who drags everyone else down was given an equal opportunity, but they squandered it and actually interfered with the opportunities of others who would otherwise take advantage of it. If you're forced to tolerate that person who is a negative and pander to them as if there isn't a problem, you're held hostage by the weakest link, and the entire group wastes time on fundamental problems of getting any work done at all, while they should be moving up the ladder of solving higher and higher order problems. Eventually, the frustration of the negative actor begets apathy and a sense of insurmountable problems, and endless discussion about matters that should never need to be discussed while real work goes unfinished. This is the condition of America in 2016.
This is quite a good response. Even though I criticized you for depicting overly positive picture of Japan, I praise you to bring this point out. I am not an American but I like America and its open culture. But what you are saying is also important. An excessively open culture that also tolerates negative elements is headed towards trouble. And if it forces/preaches its "good" members to tolerate the intolerance of new/old "bad" members, then the "good" elements in that nation feel frustrated and the nation as a whole slides down the path to failure. I guess, the excessive "political correctness" might be forcing America the way you are suggesting.
