Games about snipers give every gamer the opportunity to feel like a silent killer who takes the lives of important government officials, commanders of entire armies and other persons who could prevent the main character from achieving some very important goal.
In shooters about snipers there are a lot of details that can greatly change the way you look at already familiar shooters: you need to fire a shot from a sniper rifle only after checking with a whole list of data. This usually includes the distance to the target, wind speed and direction, the chosen caliber, obstacles and the number of people who will see the chosen victim die. You can't just kill the target you want.
Often games about snipers are about the times of World War II, but there are exceptions: for example, the Hitman series of games also has “sniper” missions. It is the chosen time that determines how difficult it will be to hit the enemy.