Look at last game where we lynched a townie day one, used that information combined with night information to lynch mafia on the two consecutive days.

If you choose to lynch Sin then you will either not lynch a Town power role or you will lynch an anti-town role. Both are a win for the town.

If you choose to lynch Stan you are most likely lynching a non-power role Town, or possibly a third party character, which could most likely be anti-town. You are removing someone who will not contribute while being alive. The information gained is the same that was gained last game.

Choosing you lynch someone else, seeing as how there are two other VTs, gives you a huge chance to hit a power role. Since Town always outnumbers anti-town, and you've eliminated two VTs, you are at an extremely high chance of hitting a useful Town role, something that will greatly hinder the town operating at night or their ability to openly discuss information during the following days.

Sin is one of two things: Mafia or fucking retarded.