But people aren't being encouraged to dob people in for 'wrongthink' - I know some things in recent years have tended that way, and if it was that sort of thing obviously people wouldn't and would be right in being worried.
But when a virus is raging out of control and the only way to stop it is to stop all non-essential social contact (parties that are so loud that they are disturbing the neighbours qualify) then something needs to be done.
The fact is you can already report people for noise if it's impacting your life, so this kind of thing is not unprecedented. No-one goes around complaining that that is like 1984. Arguably this is much more serious.
If you just have the attitude everyone in society can do what the hell they want then murder becomes legal. What if the OP saw the neighbours burying a body in the backyard - that's 'dobbing someone in' if reported? How far does this get taken? People have lost lives because others behave like this.
The boundaries in society change in different situations.
The fact is if we'd imposed MORE controls and checks earlier on (e.g. not just relying on people arriving at Heathrow to isolate out of the goodness of their heart) then we'd be more likely to be like Australia - deaths = 909, rather than deaths well over 100,000.
There does need to be careful scrutiny that things go back to normal afterwards but for now I do think people should report those breaking the law. Maybe they're not breaking the law (seems highly unlikely), in which case a quick chat with the police will no doubt sort it out and no harm done.