iNat is based on the principle that anyone can add an ID to any observation. Most of the time this works reasonably well – the vast majority of people add IDs conscientiously with at least some knowledge.
Occasionally it happens that an over-enthusiastic user will start adding IDs without sufficient knowledge without realizing why it is a problem, or a user may join at the same time as a friend who uncritically confirms their IDs. It sounds like something like this may be happening here.
In such cases, we are encouraged to assume that people mean well and attempt to engage in discussion with the user about their basis for their IDs. A reasonable portion of users who have been making careless IDs will change their behavior and be more careful about making IDs for others once this is pointed out to them. You can also @ mention other users whose judgment you trust if you suspect that wrong IDs are being made.
If someone is making a lot of heedless and incorrect IDs and is not responsive to feedback, there are mechanisms to notify curators/staff who can take more effective action if needed.
Some of the discussions in previous threads may be useful: