If my neighbor ignored doing the right thing in a timely manner after trying to cooperate with him in a neighborly way, I would. If he won't protect his own family and those living near, then it is out of his hands. Garbage disposals do a great job of grinding all kinds of stuff into tiny particles so it flushes easily down the drain. That's the problem. Additionally, organic debris is eaten by the resident bacteria in the soil, but the deeper you go you lose oxygen and the bacterial balance gets upset, the dead bacteria bodies are not consumed fast enough, they build up until the little bodies form a dense clogging blanket that gets thicker until water cannot pass.
Septic systems are understandably fragile because they use soils.
Put in the garbage disposal and you gamble that your system won't become unbalanced. If you compost, the garbage disposal is probably a waste of money.