Some thoughts I've mentioned before but have seen vividly displayed in some recent projects:
Exhibit too much of any virtue and you'll plunge into a problem. You can indeed be too kind, too analytical, too bold, too tolerant, and too open. I've seen organizations and departments that suffer from excessive virtues - conditions that have turned poisonous - and they fail to see how they have overdosed on a good thing.
That lack of balance is a common problem. My guess is that most of us are afflicted. Once we label something a strength, it is hard to see its dangers.