Ok, if that is not enough. Let me give you more (yes, there is more). 

If you are in a client that doesn't support reports and you make post people don't like and they start reporting on Amethyst, your post will disappear from everywhere and you won't even know. 

If we send the warning reaction, you will know that some people are reporting you and your post and in some cases whole profile is now tainted. 

I always side with letting people know, even when their client doesn't want them to know.