In the infantry, the whole company is behind you, behind it is a battalion, guns, mortars, attached tanks, aviation... and all this works so that you complete your task. Of course, they can kill you during the execution, but the specific task is not to finish off Private Kiryu. For a sniper it's the other way around. Everything that is listed is against him, and he is either alone or with a partner. Unless they send tanks against them, but everything else will just wait for an opportunity to get away with it. The worst thing is that sooner or later the same sniper will crawl out against you, and whoever kills who will be alive. A sniper who has been tricked is a dead sniper.