Ok, what I thought was a pretty clear post has somehow been misread by multiple people. So here are a few clarifications:
1. There were 3 Teslas taking 3 of the 6 slots of level 2 chargers, not 3 blocking all 6 spots. The concern is that Teslas have now claimed 13 of the 16 available slots despite being a minority of the plug-ins on the road.
2. At no point did I state they weren't eligible to charge there. It is a matter of ethics/etiquette/efficient allocation of scarce resources. Hence why I didn't propose having them towed or ticketed. Though it is feasible to request management to designate them as non-Tesla since they put in 10 that are Tesla only, so they clearly can decide which brand EV can use which spot. My inquiry was about how to nudge Tesla owners into behaving better. While Model 3 sales are closing the gap, non-Tesla EVs on the road still outnumber Teslas (at least as of last couple times I looked at the sales numbers). Yet they get 10 spots reserved for them while the rest of us have to scramble for 6, and then Tesla owners take half of those. This is very poor allocation of resources.
3. I assumed they were legitimately charging and didn't suspect them of actual ill-will by 'parking without charging'. I therefore, did not inspect to verify that aspect.
4. I am aware that the Tesla spots are not as conveniently located. Due to that and my schedule, I didn't work my way over to the Tesla spots to see if those were already occupied. If I did and found that there were at least 3 spots open there, I'd have been really ticked. But as I didn't get there, I don't know on that point. My irritation is that as currently set, Tesla's which are a minority of the plug-in cars, get their pick of 16 spots where the rest of us get 6 and that is if the Tesla owner's don't hog them first. And yes, people can have a right to use it and still be rather hoggish and immoral or at least unaware/inconsiderate - this isn't a legal issue, but an ethical/courtesy one. At level 2, it could take a really long time to charge Tesla sized batteries, thus blocking that resource if they don't mind paying for parking past 90 minutes.
The free aspect could be a valid explanation for the conduct. I know the level 2 charging is free - you only pay for the parking, and that is free for the 1st 90 minutes. I don't know if there is a charge for using the Tesla spots. If there is, then I think that is a very valid speculation as to what is driving this behavior. In which case, the mentioned adjustments to pricing structure would likely be best solution if mall management isn't interested in designating the level 2 as non-Tesla. I agree that 'free' is a powerful incentive and can draw considerable lack of consideration even from those wealthy enough for an S or X model. Also the more convenient location of the level 2 versus the Tesla chargers fits in the same category - if an inconsiderate person can get away with it which under present rules they can, then they likely will go for the more convenient spot.
Looking at the #evhole site someone pointed to, I see that hogging charging spots is quite an annoyance in the plug-in community. And as both a BEV and PHEV driver, I've personally avoided charging when it wasn't needed to avoid gas use in order to preserve availability for BEVs that might need it to complete their trip. I've been in the situation of following my Leaf's guidance to a pair of chargers to find one occupied by a Volt and the other by a Tesla and had to slowly crawl to the next nearest one to charge. So I try not to take the last open spot and limit my time there to brief periods. But that is me deciding to live to a certain standard of conduct as opposed to taking every last advantage I can legally get away with. From what I've seen at #evhole, this approach appears to be declining along with many other elements of modern society.
I'm thinking an appropriate nudge is to assume the person is unaware of the etiquette aspects and the limited infrastructure and perhaps leave a note. But I think I'd want to be more diplomatic than the notes at #evhole. Those who are truly unaware might change their behavior. Those who don't care, won't.
'13 Leaf SL
'18 Honda Clarity Touring PHEV