First of all a rant against what seems to be the majority of drivers on the road – why do you think that indicating is optional?
It’s not just a nuisance, it’s dangerous being on the road and switching lanes, pulling out or moving around a roundabout without indicating to other users what you are about to do.
Especially on roundabouts so few people indicate, but it is probably the most vital place to indicate on.
It’s dangerous not to god damn it!
I would just love to hire the signs on a particular roundabout in my area (you know the ones, advertising local law firms usually) and put something rude on them to grab drivers attention about this, but its never going to happen is it….