'Everyone still has the choice whether to engage or not' is simply not true at the moment, hence why some people are sitting in dock waiting for a patch.
How to avoid mission related interdictions:
- accept mission (don't stack them!)
- jump to target system
- see pirate/authority announce their intention to interdict you ("all that tasty cargo")
- Open "contacts"
- Select the NAMED npc who just announced he's after you
- fly into the star's corona, as far as your ship can make it (if your ship can't handle heat well, get a DBX)
- turn your butt to the sun
- make double and triple sure the big blazing ball on your eight is centered and there's no space for someone to get behind you
- watch murder hobo NPC circle you and/or drop into a white dot -low wake signal-
- resume your journey
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How to avoid random interdictions:
- once you arrive, check for any spawned interdictions by going to the contacts tab (they'll come after you, so trying to get away like that might not work)
- check where the "system plane" is (plane where most planets circle the sun)
- from your drop in point, head almost 90° down (or up) from the system plane and any traffic routes for a few ls
- take a gentle swoop up (or down) to your target destination, aiming for the gap between the station and the planet it's orbiting
- once the gravitational well slows you down, pull towards the station, trying to get as much of the planet as possible at your eight
- drop out and watch for instantly spawning contacts and/or comms .. in that case, boost to the station entrance, while striking hooks like a rabbit