I'm going to make a dark joke about the California wildfires.
Why do you want to make a joke about the wildfires?
I want people to know that I'm not scared of the fires because I have the fire in me.
It's not appropriate to make jokes about terrible events like the wildfires in California. Many people were affected very badly by them, and by making jokes you're not showing them any respect.
Only a closed minded person would think a joke about the California fires is in bad taste.
Consider how you would feel if you heard someone joking about an event that devastated your life. Would you really want to make people feel like that by joking about a fire they went through?