The fanbase has made it very clear, by way of replies to threads like these, VERY few people actually want Stalker PvP mode. The large majority of people will either abort the mission the second a player-controlled Stalker tries to invade them, or just opt out of the mode entirely
Why would we play as the enemy? Come back with this complaint like two quests in the future, it might make sense, but definitely not now
Oh get off your oh-so-high-and-mighty attitude