I had a coworker who was sweet as honey, never had a smile off her face, complimented everyone she met, baked cookies for the staff and made sure to tell everyone how much she loved them. She also would stand over my shoulder while I was working and once ripped my personal tablet out of my hand so she could see what time it was, touched my things, made me want to pull out her hair. All with a smile. You're confusing being nice with being kind, and you can't show kindness without respecting someone's boundaries and belongings.

When I was young and DVDs had just come out, I used my saved Christmas money to purchase a DVD player which I let everyone in the family use in the living room. I thought this was a very generous thing to do, because it was technically mine and yet everyone was able to share it. My brother had a history of borrowing my things and then lending those things to his destructive friends who would inevitably ruin them. Well one day he decided he wanted to show his friends my DVD player. I caught him unplugging it and said no, that I wasn't going to let him bring it to their house because I didn't trust them not to break it. It turned into our biggest fight. My mother got involved and wouldn't let him take it without my permission, but instead she told me I was being a "selfish brat" and tried to browbeat me into allowing it. I stood my ground. It was precious to me and he had shown me I couldn't trust him with my things. They both said hurtful words to me. I was sobbing, but I wouldn't relent. To this day I remember that fight and I remembered what it felt like when people tried to push past my boundaries and wouldn't listen to me saying "no". But I like to think my brother learned a valuable lesson that day that he's not entitled to my things, as he was much more respectful of them and other people's property in the future.

All of this exposition to say, YTA. Children deserve privacy, boundaries and belongings. There's a difference between sharing out of the goodness of your heart and having zero control over your belongings and who abuses them.