Yeah... I have to say their hearts may have been in the right place, but this really makes no sense. IF you're going to pull a show because something in real life is too similar, then you should never make such a show in the first place.
What does a show like CSI or NCIS do when there are crimes every day? Somebody somewhere lives in a town where someone was brutally murdered when that week's episode airs and shows a murder plot...
Fiction is fiction... people do know the difference. You can choose not to watch if it hits too close to home for you.
I feel for people directly affected by this particular tornado (as I would any natural disaster victims) and I can assure you that the LAST thing on any of their minds was whether Mike & Molly aired and did it feature a tornado in its episode... As is usually the case when the PC Patrol strikes, it is "fixing" a problem that doesn't exist.