There are way more military options than just invade or do nothing. There is whole spectrum of military options. You are being too simplistic.
I never mentioned invade, but I did say American lives. Regardless, any kind of "kinetic action" draws us further into a military posture, and commits USA and Americans for many, many years to come. Thinking we can do this and then stand-down is too simplistic. Besides - who benefits? Do average Americans? NO.
Do Saudis and Israelis? YES!