Do you know of any motive for the vandalism? This might help you out. Another is, has the vandalism compromised the structural integrity of the home.
My suggestions would be:
Do not consider any vigilanti actions or you will end up in jail or worse.
Check your contract. Does it have an opt out clause or what has to be done to accept completion. I don’t think I have ever seen a clause about acceptance requiring it be safe from crime so look for something else.
I assume you have a construction loan on this property so it is probably being paid on percentage completion. If so, you don’t have much leverage. If it is a spec home being built to your specs, you are in clover because as someone said before, you hold the power of presenting the check.
Meet with the builder asap and ask him what is going on with the property vis a vis the bullet damage and get his thoughts before proceeding to the neighbors because more than likely one or some of them are involved either directly or their kids.
Lodge a complaint with the local authorities, and do so after ever incident.
Were it me, I would find some way out of the contract because safety of family comes first even over losing some money.
Good luck.