Seriously.
[pulls glasses down on nose]
It is impossible for people to steal from one another in this game. No one can reach into your bags and no one can enter your house without permission. You can keep all of your belongings safe from others by keeping it in the places that are designated as yours. People seem to be confusing how they'd like things to be with how they actually are.
No one stole your meat collector: you left it in a public area.
No one planted a tree in your plot: that plot is on a public street.
No one stole your emblems from your house: you chose to let someone into your home who you did not know very well.
Be a grown up and take care of your belongings using the tools you've been given. You've just been given a free home with plentiful resources. Enjoy it!
[pushes glasses back up]