We are living in an unpredictable environment and anything morally sound or to have a chance to follow a perfect example is hard to come by.
In such a crowded environment, something morally ugly or bad habits are easily learnt and followed by many innocent individuals. It is true that something good to happen, one has to be really lucky and needs to make a lot of effort to make things right because such an effort is worthwhile. Therefore, the wise will always follow the right example because at the end of the day, we are the one who have to be responsible for our own action and face its good and bad effects.