is it worth having to live in constant fear?
If it's not one thing it will be another. I've had some seriously dangerous sorts for neighbors too, it's not worth it, you should look to move elsewhere. Their whole philosophy is a threat to you and those you love, it will never be confined to just one incident, there will always be something... And if it's not them targeting you it can be you caught in the crossfire as others target them. I'd move house. Have before, never regretted it, only regretted not moving sooner.
Best wishes.