Seems like using a truck locked in 4lo to shove their POS cars into each other would do the trick.
You're halfway there. Instead you run a tow strap from the tow hook on the last car in line under the whole row perpendicular to the direction they park.
Then you go in 4lo, and pull that last car sideways into each of the other cars.
Everyone looks at the end car that started the pileup, but, the whole side of the car is dent and scratch free, no evidence of impact or external force knocking it sideways.
Only logical conclusion is that car fishtailed into the others knocking them all sideways, and the driver must be at fault.
Slim Jim the door, drop a bag of substances in plain view on a seat... QED