Except for the simple fact that Conservatives are advocates of freedom... which is diametrically in opposition to the ideals of Islam. As far as Democrats are concerned, I beg to differ. While there are many weak Republicans, it is the left in this country who try to tie our hands in every conflict. It is they who weaken us, and it is they who have taken over the Democrat Party.
The farther to the right you go with conservatism, seems to lead to less freedom, as they tend to become authoritarian or Theocratic and hamper freedom in the name of Conservatism.
The left has similar problem with freedom on the left end, with Communism and anti Capitalist controls that stifle freedom and innovation as do the exorbitant taxes.
So, both ends have bad results. As with most things, the answer lies somewhere in the middle and that is what our two party system is designed to achieve. You would not like the world that would be created when one party managed to destroy the other, and that is the simple truth of the matter.
I wish more people understood this, and realized that every variation of political thought has a place and a reason to exist.
It is a question of balance and when it tips to far either way, freedom is the first casualty.