Hollywood’s selective onscreen destruction

For those with a certain attraction to B-movie, tongue-in-cheek cinema, the “Sharknado” series has been a must-see summer tradition. On August 6, the fifth installment of the meteorological predator action, “Sharknado 5: Global Swarming,” will arrive on the SyFy Network. All manner of ridiculousness is assured, from questionable special effects to stunt cameo casting and premise-stretching…