Con's (from a compounders point of view)

They're easy to use, although my bow is easier I don't want anyone to have easier than my easy
They'll bring more people into archery season and I want it all to myself
They might result in more deer being killed and I want thos deer for ME to kill
P&Y and PBS says they're evil

4 of the most common reasons right there - not sugar coated just the plain truth.