It does hurt Tesla. People don’t want to buy a car likely to get vandalized. One incident won’t make a noticeable difference, but if people think it’s okay to vandalize them it absolutely would hurt sales regardless of your opinion of the morality of it
Look at Tesla stock it’s literally dropped >20% since he did that. You’re literally giving an example of how it does. “No such thing as bad publicity” is not a real thing. The Hindenburg didn’t help the zeppelin industry.