There are no data in these posts that would permit a conclusion about which topic people get most upset about. None. A topic was posted asking a specific question. People responded.
The rule on iNat is Assume people mean well. People talk about a lot of things here, including the things you consider important. A selection of links is below:
https://forum.inaturalist.org/t/choice-of-diet-vegetarianism-poll/8773
https://forum.inaturalist.org/t/agricultural-practices/23501/17
https://forum.inaturalist.org/t/climate-change-how-can-we-stop-it-how-much-worse-can-the-problem-get-why-we-need-to-stop-this-now-why-i-care-about-action-and-more/22619
https://forum.inaturalist.org/t/peoples-thoughts-on-pets-zoos-species-subservience-conservation-etc/20301/13
https://forum.inaturalist.org/t/peoples-thoughts-on-pets-zoos-species-subservience-conservation-etc/20301/13
https://forum.inaturalist.org/t/should-cats-be-culled-to-stop-extinctions/1628
https://forum.inaturalist.org/t/cats-good-or-bad/7290
https://forum.inaturalist.org/t/nature-and-plastic-project-for-france/11394
https://forum.inaturalist.org/t/plastics-from-clothes-in-the-environment/21981
https://forum.inaturalist.org/t/do-you-feel-that-by-exploring-nature-we-are-also-killing-it/18371/69