The rights and wrongs of bombing

World War Two was the first war that was decided primarily by air power. When Louis Bleriot completed his first flight of the channel he was asked by a journalist exactly what this new contraption, the aeroplane would be primarily used for. He answered succinctly.
"La Guerre." War.
Aerial bombing was often found to be ineffective, inaccurate and sometimes caused more problems than it solved. This little bit of footage of the battle of Montecassino demonstrates how air power was useful to the allies, but also how it often caused as many problems as it solved. Also, ask yourselves this, was mass bombing ever justified, given that so many civilians were killed at places such as Montecassino, Dresden or Hiroshima?