I think, in this specific case, SpaceX should be held to a higher standard than one normally would be. Normally you don't claim that you intend for your rocket to blow up when you launch it. If they're going to go around saying this wasn't an accident, then they should have had a much, much better plan for cleaning up the mess they made.

I think litter laws should apply in this case. I'm afraid it would never get enforced because the US justice system tends to let the rich get away with anything, but dumping 200 pounds or more of commercial waste in Texas carries a minimum 180 day sentence under Texas state law (https://www.ennistx.gov/Illegal-Dumping-Violations/).

Not something I think should apply in the case of a true accident, or if you had a good plan to really go above and beyond in terms of mitigating the damage (not necessarily perfect, but very good).