I am not totally against the idea of preemptive action, but the circumstances under which its used should be much more narrow and ethically based than the circumstances that the current US administration has used it under. The invasion of Iraq for instance; I cannot see how that would fall under any narrow or ethical justification, for preemptive action of the kind that was used.
As for the US doing what it wants because it has interests, well in in psychology, people who constantly act violently in their own interests with out consideration for the rights and feelings of others, or without any residue of moral unease, are called psychopaths. So, unless the US thinks a world of fear and hate is in its best interests, modeling US policy upon a mental illness might not be a good idea.
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"Religions are all alike -- founded upon fables and mythologies"
- Thomas Jefferson
For small creatures such as we the vastness is bearable only through love.
- Carl Sagan