“The days of beating the tar out of someone instead of calling the police can backfire heavily.”.
They have to catch you first. Once the perps laying on the floor all smashed in and you are long gone, let them first find you and then prove who did him in.
Get the job done quickly and then get out of Dodge.
It is getting to the point where the law is going to be on the side of the perp 100% and vigilante justice will be the only justice.