I recently bought a used laptop from a graduated college student, and she didn't format her hard drive.

I'm 36 years old, and recently i wanted to buy a used laptop for my niece who is going to college starting this year. I searched on facebook marketplace and a few other places locally, found a good deal on a laptop, so i bought it. Upon bringing it home, i wanted to check it out, how it works etc, just to be sure, before i formatted it and make it clean, i noticed the Woman that had sold it to me, left literally everything on her laptop. I don't know why she would be so careless, but she had dozens and dozens of folders with photos of her and friends of hers, and I'm quite sad to say a few folders were with her trying on outfits, lingerie, half naked, fully naked and then a few folders with videos of herself, fully shown, some only from the waist down or different angles, but a lot of them were very clearly showing her face too. The videos were of her doing things to herself, with and without toys, naked dancing, stripping, and in general just not caring about anything in the world behavior. I don't know if i should let her know that she should be more careful before selling things to others, and how a lot of people could literally destroy her life by posting all these things. I feel bad for "snooping" but i did buy the laptop and i wanted to see how it worked. I dont know if i should feel bad or not, but i can't unsee what i saw.