That is extremely dangerous! Thousands or million of people will be affected if they fail their launch. The sad part is those innocent young children.
Because of the bad quality of their missile we are in trouble.
Don't understand your logic. If the launch fails and the missile lands in the ocean, then no lives will be lost. On the other hand, if it reaches its intended target, then we can expect huge number of casualties (can't quantify the number, as we don't know much about the potential of the DPRK nukes).
Why do you assume it's going to fall in the ocean?
They might target Sidney (see their recent threats) and a misfire might get that rocket to land in Delhi , or Kuala Lumpur.
Or they might hit China, that would be something like a karmapocalypse.