Because this protective trait also interferes when good things come our way. It makes us resist the good as well as the bad. It's the kind of thing that keeps us from liking spinach until later in life. Changes of all sizes are happening at an ever increasing rate. If we rely on our initial instincts we may be losing out on many good things that are happening around us.
Ignorance can be hazardous to our well being.
There is absolutely no truth to the phrase. In fact, fighting city hall has become one of the biggest and most profitable industries in our nation. By city hall we mean government establishments, big and small, local, state, national and sad to say, international. By fight we mean any activity that attempts to change those governments in a way that the bureaucracy doesn't necessarily appreciate. The Senator awakes one morning to the realization he hasn't been to the Caribbean lately and would like to go but is short of walk around money.