Nothing is too personal.
I've had pen pals since I was a teenager. With the influx of email and texting, the art of pen pals and writing with true thought provoking conversations with others falls by the wayside. Society is just too rushed to take time to get to know someone because life gets in the way, the kids are around, the holidays, the jobs or whatever the excuse dejour is that people don't communicate in a meaningful way anymore.
Then I discovered there are people whose lives do NOT get in the way of friendship and communication. People I can bounce ideas off of and learn from and share my thoughts with who can share them in return and I can learn from. It's INTERESTING. I don't use the computer, I use an ink pen. So do they. I can tell them things without fear of being judged, they can tell me things without fear of being judged. It's cathartic.
I get way more from it than they do. I hear from them about the schemes that they or others play on pen pals who are the type to send money and such - but I make it clear upfront that I won't send any money, and that is respected by the ones I write to.
These people are as different from each other as you and I are. Out of everyone I've written to, only one is innocent, but there are some who need to be in prison forever, some who probably don't need to be there and one who definitely doesn't. It's individual.
We definitely don't talk about ministry stuff, unless they want to air their views and hear mine - but I'm not interested in changing anyone's mind, I accept them as they are, otherwise, there isn't any point in writing.
We definitely don't talk about details of their crimes. Maybe a question or two if something in their files makes me feel a need to ask - but there are plenty of whack jobs out there wanting details (gory details) of crimes and they call them "fans." I am not a "fan." I don't want details from them, only from tv and books where I can have some distance.
I love to get mail. I love to send mail. It works for me.
PS
I have sent some books to one pen pal, and a stuffed Harley Davidson teddy bear to another one's daughter - but that was my choice and my idea, not theirs.
*additionally*
Even though I say I don't judge them - initially, I do. I would never want to write to a child molester and if I even think someone is lying, I stop writing. No point in someone just telling me what they think I want to hear. I can talk to myself for that.