What are two actions about the U.S. Cold war that were harmful to American Society?

One that hasn't yet been mentioned is the enormous amounts
of spending based on estimates of Soviet power including both conventional weapons and
nuclear weapons.  We know now that we overestimated the actual amount of weapons the
Soviet Union had on almost every level and we spent huge amounts of money building up
weapons that (hopefully) will never be used.  The billions of dollars that were spent on
projects of enormously limited utility, for example the triangle shaped stealth bomber
that would take off from a carrier, were completely wasted.  They might very well have
used this money for more effective purposes, but one would also argue that we were
acting on the intelligence we had at the time so...

A
second might be the incredible emphasis on the idea of us and them, two sides that can
only be opposed and will never actually be able to reach an agreement.  We have a huge
problem in this country because every issue is almost always portrayed as right or wrong
and black and white.  With the Cold War it was either us or them and we were willing to
go to places like Korea and Vietnam to fight against the Soviets in
proxy.

This lack of openness is never helpful in terms of
helping a society to be open minded or to help both its own people grow and advance as
well as being willing to do things for the good of the rest of the
world.