That conscripted soldier has a severe brain injury that is causing his behavior, the guy is seriously injured. It may be shrapnel to the head, or just concussion but he is having a very bad day and probably the rest of his life will be altered by this one moment. The harm to any individual is a sad event, it may be necessary but it is not a point of amusement I would suggest. The Russians are committing horrific acts, they need to go home, and if they don't then they need to be neutralised, and that does cause death, all of which should be regrettable at the same time as it is necessary.
He's a volunteer, no Russia conscripts allowed in Ukraine.