I don’t know if it’s prudent — I just don’t have good enough information. But Trump has been successful with foreign policy thus far and doesn’t seem to want an Iraq style occupation with its attendant costs. So I give the benefit of the doubt and see how it goes. If it goes well I’m for it. If it goes badly I’m against it. And by well I mean advances American people’s interests. And by badly I mean the opposite.
The American people wanted the government to stop spending billions of dollars on these endless conflicts in the Middle East, so it seems antithetical to America's interests on its face. This is why his approval is plummeting.