Do morality and conscience require the ability for abstract thought (ie, an IQ north of 90)?

The higher the IQ, for instance, the more clearly a person can recall the past and see into the future, to use the subjunctive (if everyone does what I am about to do, the world will be a better or worse place), and to see the benefits of cooperation. Lower IQ, therefore, are less likely to have a developed conscience and deserve much closer minding. In my life, I have noticed that people with a higher IQ are more likely to exhibit loyalty, gratitude and empathy.