Shows that they recognize how vulnerable they are, with so much riding on the one guy. There is no clear second ready to replace him. He has developed a Fuhrer cult around his personality.
Many movements are dependent on the unifying leader - when he is taken out, the whole thing collapses (Tamil Tigers, Shining Path).
With all the people Erdogan has pissed off, there would be a long list of suspects, foreign and domestic.
Well, he is not helping his cause. He may think he is, but he lives in an illusion.