Imagine justifiably criticising a bad trait that someone has in the hopes of having them improve
Most people are going to take that as a threat because they hold that trait deer to them and / or view it as a part of a themselves
americans are likely viewing the criticism as a threat to themselves and their country and are responding with emotionally fueled responses instead of logic based responses
americans should learn to meditate because it can help with the issue of wanting to respond to percived threats emotionally