We take decisions based on various input factors and considering various side effects. Some we forget. Some we ignore. Ignorance is a gift in one aspect because at certain times we have to be quick at taking decisions.
But in this success obsessed world we are misusing the gift of ignorance and actively ignoring side effects which will occur in long run, concentrating on short term achievements. Active ignorance is equivalent to lying to ourselves.
I will end this thought with a favorite quote.