This may be a dumb question, but it's sincere and I'd like an answer. If I can have my neighbor arrested for punching me

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3. Generally, the police and other enforcement agencies decide whom to arrest

and prosecutors decide whom to indict (subject to grand jury approval).

You can't directly have your neighbor arrested. All you can do is call the police make a formal statement. This alerts them to a possible crime and provides some initial testimony. Based on that, they *may* arrest your neighbor and a prosecutor *may* pursue the case.

But generally. It's not in the control of the victim or the witnesses.

In this case, they have plenty of evidence and are well aware of the case already. The decision to arrest, indict, and prosecute is more complicated than in the average shooting given that the killer is a federal agent and the fbi is involved and interfering with any state or local investigation and it has national attention and political implication and so on.

I certainly hope he will be charged at some point, but I expect they will make sure they have a very solid case before they act on it.