User blog:Wolverine844/Flash Villains

Why are they killing off loads of villians in The Flash?

There are only two alive at the moment (Captain Cold and The Mist) and they could re-use the villians like they have down in Arrow. Yes, they have killed of some, but kept a lot alive like Deadshot, Deathstroke, Bronze Tiger,Cupid and Malcom Merlyn. So why are they killing them off in The Flash?