There may be another way ... Trust, but Verify. This was Ronald Reagan's answer to the Cold War - take people at their word, but make it no secret that you will actively verify their claims.
Trusting no one beyond this works for me, since I have rarely been disappointed, and even pleasantly surprised on a few occasions.
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I have no love for Hamas, Hezbollah, Iranian Leadership, Islamic Jihad, other Islamic terrorist groups, OR their supporters and sympathizers.