The experts are likely exhausted. Having seen the amazing collection of expertise on iNat, it is easy to see how the expectations of people/the masses/non-experts become tiring and time consuming, even in a friendly environment like here. It is not that they are inadequate or unwilling, but that the demands on them are too numerous.
This is exacerbated by people that are unwilling to use logic and look for information for themselves - the internet has trained us to look for easy answers (and maybe also education has failed us). Another detracting factor for experts giving their input, is that on the internet and social media there are people that will deride and attack knowledge and expertise because they do not agree or because they find it condescending.
The iNaturalist community seems to avoid this issue, and I hypothesize it is because people are here to learn and to share, not to be right.
And I would argue there is really no requirement for an expert to be a decent human being, though we would like this to be true. Thankfully iNat tends to attract those that like to share their knowledge :)