After that ending, there has to be a seventh series. There are far too many loose ends. After all, who is Carmichael? Good/Bad? She's still an enigma to me.
Remember that Causton is the most dangerous place to live in the UK. This small English village has seen 222 murders since 1997. That's nearly 1 a month.
Suspend your disbelief man! It's only drama.
In all seriousness, I started to think the same too. Shows like this have to tread a careful...