If you believe strongly that the government is an out-of-control terroristic undemocratic police state and We The People are divinely endowed with the right to bear arms against it (like so many people in this thread do), then you must recognize that an agent of that state would be taking an incredibly stupid risk by entering your home in a way that would give you an opportunity to shoot first.
Maybe you think that risk is the price of doing business with an unjust institution, but the officer serving a warrant against you probably doesn't.