Absolutely. So many people don't care about their neighbours, at all. You definitely get points for trying. You seem to have a good heart OP. :)

Plus, if it was op's first day in the house, then they obviously weren't aware they had a leaky roof. Not your fault op. Glad you cared enough about the other people to sacrifice staying around during a possible fire to help them out.

Since there wasn't actually a fire, they probably didn't smell anything in their house and we're worried it was their neighbor's instead.

#8, the FML reads "...turns out my roof leaked onto the fire alarm, causing an electrical fire" There was a fire. It is possible that it was in the wall which could lead a person to believe that the fire started on the other side instead of inside the wall.

They may be in a duplex or condo.

There was no fire in my house initially and I was told our alarm systems were connected. When one goes off, they all do. But apparently they had installed their own system in the period when I was waiting to move in.

And Me. So let this be a lesson to everyone, stop assuming. I'm tired of being an ass.