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If you're going to Torrent you need to keep one in your pocket at a minimum.
Public or private,you should be running hiding your ass through a VPN or seed box.
Private trackers run ratios to make sure that content stays available. Well you can find most of what you want on public trackers there are always a few things here and there that are much easier to find in private.
Security-wise I don't really think there's much of a difference. Private trackers get infiltrated and shut down they're just much smaller when it happens so you don't hear about as much.
I always wonder how IPtorrents is still running. It's a bit bigger and has a less than savory reputation, so I figure it would draw more attention.
I think the copyright trolls are just lazy they just want the easy apples.