It is unreasonable. Conte was a Juventus legend. Mazzarri was just another coach who had a couple of decent results. The ultras pushed for Conte hard, some of the reason why he became coach. Guildolin
Donadoni
Allegri was coaching the previous scudetto winners. He couldn't even be considered.


Same goes for Guidolin.
The point is he wouldn't have been the first choice by most fans, whether they'd opt for Guidolin, Mazzarri, Donadoni, Allegri, Prandelli is another matter, but Conte clearly was percieved as another bad move.
