You don't need Linux to torrent. The VPN is so your ISP doesn't send you love letters. That's the useful thing. Once you have a VPN, there's no reason to be paranoid about conventional piracy behavior.

If you're paranoid anyway, it's more than just your choice of distro. OpenBSD is kinda made for paranoia, but you still have to think about who you're hiding from, how much is at risk if you get caught, how much time and money it's worth investing to protect yourself, what threats you're up against etc. Like, are you more afraid of downloading malware or being caught breaking the law?

If you just want some movies and music, get a vpn and go nuts. If you have no vpn, you can avoid being noticed by not sharing stuff that's popular when it's popular, like blockbuster movies.

Tails is a USB bootable linux distro folks use to buy drugs, FYI. Tor is helpful for staying anonymous from some companies and governments. I2P may be more private than Tor. Like, if you're afraid your government will put you in jail for political beliefs, then you start looking at in-depth OPSEC.

Any distro is fine for piracy, ~~you could also set up tor tunnel for torrents~~ Only if your client supports it if ISP is something your worried about or just use a free VPN service

Literally stop being paranoid and do it. Prosecuting individuals for reproducing copyrighted material is almost never enforced unless you're directly angering the copyright holder.

"security" in /Linux distributions is using up-to-date software and having common sense OPSEC. I suggest you read up on the computer science of torrenting first and then pick your preferred libre bittorrent client with a VPN.

Sorry if I sound a bit standoffish but you have to rid yourself of the idea that there exists a "secure linux os." The only increased security with libre software is your own knowledge and know how.