They're very portable, so you can carry them around with you in case you come up with an idea of something to write on your Tesla while you're out and about. They stick to the surface quite well and don't wash off in the rain.
(Please try not to succumb to the temptation to write "F**k off Nazi Scum" or similar on somebody else's though like other people are suggesting. That might encourage people not to buy Teslas, which is a shame, because they're great American cars.)
While I think this is a fair opinion for all recent swastikars, I know several people who bought a Tesla a decade ago when it still seemed like a positive. They all abhor Musk but are not in a financial position to trade in their paid-off cars for anything else.
Why are you saying that it is okay to support Nazis if it is not financially feasible to do otherwise?
If they’ve already bought the car Elon already has their money. Buying another car because we now know what a piece of shit Elon is, doesn’t change that.
If they bought a cyber truck they are pretty much guaranteed to be a dickhead.