You should join the group and read the post. They were like
1) I was at X restaurant and saw a table who had no food or drinks yet. Both were not wearing mask so I complained to the manager. We need to keep restaurants safe
2) I was at Walmart and saw a person with no mask. I reported it to the manager and was told they're too busy and will deal with it later. Comments later were to call corporate to complain
3) Here's a pic of a morning line to get coffee, no 6 feet spacing. Who can I call to report this to
4) *Post flier of a concert. We need to make sure this is event is stopped, shall I call 911 or the covid hotline
5) My neighbor I know who isn't vaxxed and said he didn't test prior to returning from a mainland trip went out to eat (broke X days quarantine). I called 911 on him.
6) My neighbor is having a BBQ of more than 6 people, shall I call the hotline or 911
And many way more post like this. Then ontop of that if you disagree with the group thought, you get booted from the group. So if you also post medical information or studies that go against the narrative, you get the boot. If you question the mask wearing, some will reply in a harsh/derogatory way.
So when I make the statement we know who would rat out their Jew neighbors to the Gestapo, it has some evidence behind my opinion.