Genuine question. I thought cars were engineered to be resistant to this?

It can’t just be as simple as holding a lighter next to it, right? What exactly are they using to achieve this?

Is this specific to Teslas? If not, why aren’t cars engineered to be resistant to whatever they’re using to light them on fire?

Furthermore, wouldn’t the protestors get caught? If not, then how are they evading all of this?

Just to be clear, I’m not fond of Musk. I’m just trying to understand the situation from both an engineering and social science perspective.