This might just be me, but when I say 'outnumber the town' in a mafia's win condition, I actually mean outnumber the non-mafia side. Most role PMs I've seen here say something along the lines of "create conditions wherein you cannot lose", which implies keeping independents alive keeps the count against you.
In Havendale 2, my condition was to kill everyone. I managed to survive right until the end by claiming Survivor-with-a-kill-ability to the town (but then they lynched me ;_;). The thing I like about Survivor roles is that it encourages a lot more prediction and logic - you have to try and guess which side would be the best to side with.