Exactly so.
The point was made that if proper anglers take their litter home then there are a lot of anglers who aren't "proper". You then listed a variety of baits left behind which are not an issue to anyone but a bonus feed for the wildlife. Quite correct.
Jeb and I have mentioned baits COMMONLY left on the bankside as death traps for the wildlife, and you have pointed out that this is littering. You are right, it is littering, by anglers.
I have been known to drown a worm or two in my time and the crap left behind by idle morons annoyed me then making me feel complicit in their oafish conduct. I quite understand that proper anglers such as yourself with a proper respect for the bankside enviroment and its occupants will feel similarly let down.
I would be astonished if any angler of any experience has not encountered entanglements of hooked monofil hanging in bushes, half empty jagged bait tins and picnic litter left behind by anglers with less intelligence than their bait.
That is not to tar all with the same brush, but rather to recognise that you probably hate such conduct more than boaters do.