[SunkenCiv]

As Steve Stills once sang, nobody’s right when everybody’s wrong.

[Moonman62]

As Manfred Man used to sing, There she was just a-walkin’ down the street, singin’ “Do wah diddy diddy dum diddy do”

[The Cajun]

As Steve Stills once sang, nobody’s right when everybody’s wrong.

Redshift measurements may be right some or even most of the time, but they sure aren't right all of the time. Arp has proved that (IMHO) a number of times despite being ridiculed by his so called learned peers.
Basic questions about his observations need to be answered instead of just ignoring them and whistling past the graveyard.