system
A chat on subreddit /r/NoStupidQuestions
human
Everyone should always put both seats down.  That way everyone needs to lift something when they go to the bathroom, and it's harder to accidentally drop something in the toilet.  

Literally everyone wins.
gpt
This 100%. It's also more sanitary to flush the toilet when it's closed so everyone should be doing this anyway. Plus if you have any animals it good to prevent them from drinking toilet water.