>> Categorizing in terms of absolutes, such as "there are no liberals who ..." and "no conservatives who ...", is to engage in reductionism ...

>> This is simply not true.

> it simply is :)

People make choices for a multitude of reasons.

Sometimes those choices are knowingly to their detriment and can be confounding to others whom are not a part of their decision process. Many times the reasoning is "sacrifice for the greater good", where "the greater good" is defined by the very people who are the harbinger of their pain. Other times, it can be as simple as; "my life sucks so everyone else's should too!"

I am sure there are many more categories which could be provided as well.

But to say:

  .. for majority of people every single opinion and thought 
  they have just magically lines up with one political party ...

Is to be so dismissive of people as to be the height of arrogance.