Shady sides may be powerful and painful, but they are only dangerous for the case, that they are dissimulated or suppressed.
Weaknesses of character appear in contrast similar to a subtle, creeping poison, and can’t be dissimulated or suppressed at all. Though the danger here is the ignorance of the tolerance limit of individuals, for which the impact of the poison will arise at an unknown and unpredictable point in time to unfold abruptly its full potential.