so you want to do missions for the nomads. shouldnt that like increase your rep with everyone but the nomads/wilde/outcasts?
and this was brought up several times before. ana rgument that was used that i remember the most:
"We can now strike the Nomads where they will feel it. One of their leaders Diego Alvara has bee ratted out by one of his men. We want you to get there, arrest him, tractor in his pod and return here with it."