What do you do when you see misinformation being spread on Facebook?

My grandma really loves to blindly share things on Facebook. As an example, here's something she shared this morning

And every part of me wants to go OFF about it because 1. It's using an actual tragedy that happened back in January to tell a false narrative and 2. It's trying to overshadow the actual tragedy that just happened in New Zealand.

Don't tell me "unfollow/unfriend" or any other advice because that's not what I'm looking for. If that's what you would do then fine but keep your advice to yourself.

To make this more controversial, in the comments, do you think there is any benefit to shedding light on the misinformation and telling the truth, or do you think people will believe the narrative they want no matter what the truth is?