Lost $10K to scammers, found out their home address and want to take action

There is a real chance that you haven't found the scammer. You may have just found another victim. The risk to you is that you decide to try and scam the scammer, or you try to physically strike the scammer, and then you find out you were wrong. The police will then become very interested in you.

If you haven't contacted the police and/or your bank do so now. They are the only ones who can do something about this.

As others have mentioned:

1. You could attack an innocent person.
2. You will face legal ramifications if you do attack whoever it might be — their wrongdoing doesn't exempt you from facing consequences.
3. Let the criminal justice system deal with the scammers.

AND equally as important: you yourself might come to bodily harm — if they are scammers I'm sure they are prepared to defend themselves, they might have a gun/baseball bat and you might end up dead or disabled.

Go to the police, it is the only reasonable and safe action you can take here that will not result in further harm to you and your family.

Assuming that these guys are scammers, you have no idea how professional these people are. They could be part of a gang, they could be part of a mafia group, they could be terrorists, you don't know exactly who these scammers are. The best thing to do is to clear your head and tell the authorities what you have found.

In the first place, you should have actually contacted the authorities yourself, get a hold of your banks if you could, and see what you could have done there. While I don't know your current status and what you had to do to get to this point, I know that if you didn't do this as a last resort, then you should really reconsider your plan of action.

Never, ever, take the law into your own hands: the state doesn't like competition, and assuming that you're a law-abiding citizen who hasn't obscured his identity you're an easy target.

As others have said, report it to the police... I assume your (or your daughter's) bank is already aware. If you don't get satisfaction that way, then use the services of whatever ombudsmen are appropriate to police regulation, or in extremis look for help from your local elected representative.

Yeah, you do have a self-help option...

SUE THEM! It elegantly solves all the problems

Because of the fraud, they're into you for at least triple damages, and possibly a lot more if their behavior would enrage a jury.

Suing someone is a "self-help" legal solution that allows you to forbid, compel, or take money damages. You can't send them to jail, but if their conduct is illegal and disturbing, the judge can refer the case to the District Attorney's office for criminal prosecution.

In this case you engage an attorney.

• This can be out-of-pocket in which case you pay the lawyer regardless, but keep all money collected.
• Or it can be on contingency, which costs you nothing out of pocket and you get 2/3 - (the lawyer collects 1/3 for services rendered) -- but a lawyer will only agree to that if a) your case is winnable and b) the defendant is collectible.
• Lastly, you can self-represent if you really, really want to... but unless you're careful, detail-oriented and willing to do a lot of research, you'll probably find yourself swamped with technicalities.

Now, what about those downsides?

"They are criminals and they beat you up or murder you":

They won't get to meet you. Their first encounter will be with your lawyer's process server throwing a piece of paper at them. If they threaten or intimidate the process server, those will a) be completely new crimes, which the process server (as an independent third party) will gleefully report; and b) this will wildly prejudice the lawsuit in your favor.

Other than that, they interact with your lawyer and the court.

If they're an organized crime ring, they'll have their own lawyers, who will use the legal system to resist you. Not their first rodeo; they know better than to physically threaten lawyers, process servers, or litigants.

"They are innocent victims, tricked by the real scammer to be a money mule":

They'll have every opportunity to raise that objection and explain their side of the story. They don't even need to hire a lawyer; they can either write it in a proper Answer, or they can explain in interrogatories (written Q&A you send them), or they can tell you the story in front of a camera when you take their deposition.