Welcome to electronic gaming.
NPC's are always coddled, given every advantage, and not required to follow the same rules that apply to humans, because we have the advantage of organic brains.
Mines work wonders on NPCs though - I have more bounty kills in my "truck" (that's a "lorry" to you on the other side of the pond) than I do in my bounty hunting ship.
My most and least amusing interdictions both have gone this way:
I came out of hyperspace at the system's star, pirate babble over my comm.
In the first (least favorite) the interdiction left me so close to the star than I took so much heat damage my cargo hatch failed and I lost my cargo to the star. Too bad pirate, you get nothing.
The second, and my favorite, I nearly evaded interdiction, but was pulled out at the last possible second, once again, so close to the star that by the time I could reorient myself and boost away I was already taking heavy heat damage. While reorienting I did see the ship that pulled me out of supercruise explode from the fury of the star. Ha! Cosmic Justice served fusion-hot!
And if you really want to screw up an interdiction and don't mind having to quit and restart twice, dive into planetary orbit while being inderdicted. You'll end up stuck in the planet with a furious pirate unable to find you. Your only way out is to quit, reload without Horizons, reset into orbit, quit and restart with Horizons once more.
So between bugs and "cheats" by NPC's, there's a lot of work still to be done.