You'll need to pay a huge cost! I'm the Vigilante of the school, there won't be anyone who'd remain in defense of the school if I'm executed.
Wait, your claiming to be a town vigilante?
The ONLY non mafia or modkill that could potentially have happened last night, when reading Gaurav's story makes it sounds like (though I'm not 100%) someone blocked the mafia and then somehow the same person was killed.
Even if we assume you are telling the truth about your position, there's 1 of 2 possibility;
1. You haven't killed anyone, which given all the modkills and townie deaths makes you a very in effective given the balance day by day was tipping in mafias favour (until last night at least); or
2. You made the kill last night, which means your the very definition of anti-town (even if your technically town and getting it wrong)
Either render you even more of a target. In my eyes, at least there's enough justification to get rid of you, I think your mafia, even if your town you haven't exactly been helping...