Maybe it works for psychological reasons. If people believe that the temperature checks work, then they'll stay at home if they have symptoms and/or feel like

Maybe it works for psychological reasons. If people believe that the temperature checks work, then they'll stay at home if they have symptoms and/or feel like they are getting sick. But in western countries, I presume some people will have symptoms and then shrug it off as "nothing serious" and continue their life as normal, thereby infecting others. So the main purpose of those temperature checks might be their psychological effect: The enhance compliance with the other rules.