That unfortunately means you have to shoot a lot of people. Trolley problems are everywhere. They just arent as obvios as pulling a lever. But your political and consumer behaviour are full of trolley problems.
So you can either pull the trigger and shoot a lot of people, which will make you a murderer, or, if you dont, through your inactions, a lot of other people will have to suffer through hidden trolley problems. Your choice.
Why open carry and telegraph your capabilities? Just shoot them from a concealed carry position. Maybe you just learned the term and wanted to use it in a sentence.