IoT makes computing physical. So if things go wrong with IoT devices, there could be significant consequences in the real world.This is something that nations planning cyberwar strategies want.
The U.S. intelligence community briefings for the enemies of the country already critical infrastructure and "the broader ecosystem of connected consumer and industrial devices known as the Internet of objects" that is capable of threatening warned. U.S. intelligence also warned that connected thermostats, cameras and January could be used to either spy on citizens of another country or to wreak havoc if they are attacked. The addition of key elements of national critical infrastructure (such as dams, bridges and elements of the power grid) to IoT makes it all the more vital that security is as tight as possible.