Under involvement does not always pay off. Instances of over involvement are not lacking either. Take Iran, for example. Through a secret police organization, he systematically tortured Iranian citizens. Needless to say, he was not very popular, and when our history of supporting him became publicly known, we drew upon ourselves the lasting hate of a nation.
Interference then is risky too.
Neither isolationism not intrusion assures national security or spreads good will toward our country. But we as Christians should not be solely concerned about the temporal repercussions of policy decisions. Rather, as socially conscious believers our reflection should extend to some deeper considerations. A reality check should include eternal realities, especially the teaching of Sacred Scripture. And while most of us do not legislate or greatly influence national or international policies, we have a responsibility to do our part to make this a better world, to be the salt of the earth, to spread peace, to be our brother's and our sister's keeper.