There is something of an art to learning from history, especially in a debate setting.
We can "learn" from history. History is like any other data, it can be processed and conclusion can be formed.
The important thing to remember is what history is
not. It is not the magic word that makes a false conclusion true.
Lesson 1:
History
never repeats itself.
By virtue of that fact that one historical event must occur before another and thus influence the latter we can see this is categorically true.
In practical application there are bound to be several differences between any two events.
Lesson 2:
History (as applied to "present day" circumstances) is not an argument, it is at best an analogy.
This flows from Lesson 1, any analogy is bound to imperfectly fit a circumstance it applies to. Never ignore the differences.
Lesson 3:
History is not karma. Less hard and fast than the previous points because it presupposes one does not believe in predestination.
For those who are not believers in karma, remember that skepticism when you call up a historical example.
Lesson 4:
A clear understanding of present circumstances is always more valuable than historical analogies when forming a conclusion about the present. When present evidence conflicts with historical examples, go with the present. It is the actual evidence in play.
Remember those and sure, there's plenty you can learn from history.
Just don't abuse it.
Iraq and the endless loose comparisons to Vietnam or even earlier Western intervention in the region is a prime example of abuse of the rules of interpreting history.