Most conservatives seem to be convinced that the United States needs a stronger foreign policy. In fact what the current mess in Iraq demonstrates is that the US needs a smarter foreign policy. A more realistic foreign policy. One that is based on an acceptance that democracy is not a magical solution to Third World problems.
Democracy does not work well in countries with significant religious and/or ethnic minorities. Iraq has a significant Sunni minority and a signifiant Kurdish minority. Holding such a country together requires an authoritarian government rather like the one Saddam Hussein used to lead. In the absence of such an authoritarian regime the best answer is usually partition. Democracy will almost inevitably lead to chaos and civil war. That such an outcome is now likely should surprise no-one.
The US needs to understand that stability is more crucial than democracy.
The US also needs to accept that well-meaning interference in complex situations like Iraq and the Ukraine is more likely to do harm than good. Smarter, not stronger, is the answer.