Aircrews have their own ROE and approval process for engagements. They aren't simply trigger pullers for the JTAC. However, there is an implicit trust in the JT

Aircrews have their own ROE and approval process for engagements. They aren't simply trigger pullers for the JTAC. However, there is an implicit trust in the JTAC, and desire to protect the ground unit. If ROE is satisfied and approvals are in place, the aircrew is generally not going to second guess the guys getting shot at.