gjsman is using the word neighbour correctly to mean someone who physically lives next to you, which is dystopian because it effectively extends the power of law enforcement inside the walls of everyone's homes to criminalize normal pro-social behaviour, and does so by manipulating and exploiting the bonds that form robust communities. It's very different to seeing someone break into a shop on the street and reporting it.

I suppose the actual issue here is the “pro social” behavior piece. I haven’t actually heard of any U.S. state where significant fines or enforcement of private home gathering sizes was done after a few months in March, most states relied on the honor system even if governors ordered allegedly strict restrictions (e.g. one “blue” state I traveled to required me to submit a form for travel, however, each time I went there I was never approached by police or anyone else to check my form and I easily could have never done it).

People voluntarily gathering in defiance of COVID restrictions is a classic "victimless crime". Comparing it to covering up a murder is an example of the type of hyperbolic language that makes it impossible to have a rational discussion about policy.