You cannot prevent the suffering of others, you can only teach how others can alleviate suffering. People don’t understand that even though there’s thousands of words, there’s even more feelings and sensations than we can describe with. It’s impossible to explain everything though language. There are things that can only be understood through experience.
You cannot explain heartbreak to someone who has never felt it before. In the same way, it’s not possible to prevent others from suffering. You can’t fully explain how to stop heartbreak, or even that it will end. You can tell them “everything will pass” or “you will move on with your life”, but the words aren’t enough.
The truth could be told to you but if you don’t understand it, then it’s useless. Remember that words fall short of actions and experience. You tell more about a person by the way that they live, than by explaining it. Life transcends linguistics.