Which were in Dresden.

Laser guided bombs did not exist in Ww2. This was men tossing big metal cylinders out the back of airplanes when a telescopic sight lined up with the target (which even then, they could barely see).

Saturation bombing was an approach that guaranteed at least a few hits to the target, and one which was used (to an extent) by everyone that fielded bombers in Ww2.

Germany bombed many other nations cities, with no regard for civilian casualties. The allies chose not to restrict themselves unnecessarily and respond in kind, hitting key targets even if they were in cities.

It's not moral, or good, but it was a decision that wasn't difficult to make.