We use 3/16' aluminum rivets for most fastening applications. We also have a selection of 1/4"-20 bolts in both steel and aluminum, depending on the application. When you need to save weight aluminum is much lighter, obviously, and an aluminum rivet is lighter still. On the other hand if you need strenght, go with steel.
We have had the occasional superman come along a twist off the head or cross-thread the bolt. That's just a learning opportunity
They generally don't do it again.