True in real life. However, I don’t think God commanded you to entertain yourself by killing people in a game.
It is for your conscience to decide if it’s okay, based on the Bible. Unfortunately, it doesn’t give any specific messages against first person shooters, but it gives more general directives throughout. “The Lord tests the righteous, but his soul hates the wicked and the one who loves violence.” -Psalm 11:5
“ Therefore, preparing your minds for action, and being sober-minded, set your hope fully on the grace that will be brought to you at the revelation of Jesus Christ. As obedient children, do not be conformed to the passions of your former ignorance, but as he who called you is holy, you also be holy in all your conduct, since it is written, ‘You shall be holy, for I am holy.’” -1 Peter 1:13-16
Once again it is for you and God to decide. Those verses can be taken different ways, and games vary, but they are some reasons I don’t like those games.