Any time we use more than one hook, trolling herring is but one example, the odds go up as to where any of them end up in the fish. Snagging is a fishing method that involves the intent to hook fish that have not actively chased the "bait." Either method runs the possibility that hooks will end up somewhere that wasn't intended. While one method is or should be highly illegal, the other is not or shouldn't be.
I gotta ask those who constantly argue that both are illegal, do you think LEO's really care? Have you ever had your fish checked for "illegal" hook placement at B-10 or any other port along the coast where multiple hooks are commonly used? The law is enforced around the word, "intent." Get off your high horses and use a little common sense. The perfect world you preach is just not that perfect.