Debate is a fundamental function of human society. People have differing
views on things, and to communicate their views, they hold debates. For that
is what a debate is: A conversation in which each side presents their views,
and (hopefully) their reasons for holding those views.
  Unfortunately, many people these days treat debating not as a conversation,
but as a contest. It is almost like a battle, a mental battle of wits in
which each side tries to "win" by defeating the opposing viewpoint. This is,
in my mind, a great problem, because it defeats the whole purpose of having
debates, and leads to ill feelings between the parties involved.
  A debate is a learning experience. The whole point of having one is so that
each side can be better-informed by better understanding the people who
disagree with them, and how those people think. A debate can be (and should
be) friendly, not hostile. Too many people debate by trying to be insulting
or demeaning to the other side's viewpoint, which is absolutely pointless and
does not in any way advance their own way of thinking.
  People, even reasonable people, can sometimes agree to disagree. But even
if, ultimately, differing opinions are held, peace between humans is still
promoted by at least understanding why each side thinks the way they do, even
if the mindset is not agreed with. To this end, communication between people
must continue with a mind to better understanding, not with the intent to
"win".