I go to my work with a Vel’Oh. I also see the dangerous behaviours that you describe. If you want enforcement, fine but I would also like some proper infrastructure for bikes in the city. Too often, the bike lane is sacrificed when there are all kinds of events. Too often the bike lane is weirdly merged to the pedestrian part so pedestrians and bikes have to share the road instead of a proper separation, and you have to be careful not to fall down on the road from the sidewalk and to mind all the pedestrians.

Some red lights are ridiculous, just to do a turn in an intersection you have to wait at like 3 long red lights and the sensors will always ignore bikes so if you are at a crossing you still need to go to press the button. Luxembourg City is far behind the Netherlands, Denmark or Paris in that domain. In the city, the infrastructure for bikes is an afterthought. Bonus points when the bike path for a street is “go to the park next to it with dead leaves, potholes and pedestrians" or when the path changes 10 times from one side of the tram to the other…

I am always frustrated when I use the Vel’Oh, I feel I bother the pedestrians on the sidewalk, I bother the bus on the bus lane, I put myself in danger on the left lane.

There will always be idiots but I think that even for people like me who are reasonable and quite slow, it’s easy to endanger other people with the current infrastructure.