I think one of the things we forget in this Era, is just how large the Victorian world still was , in 1864 the whole of central Africa was still unexplored, India was still one third virgin forest, Australia was still virtually unknown 60 miles from the coast, and South America was virtually unexplored, no one really knew about Antarctica, This world is very small now, within a day you can be anywhere on the planet give or take a few hours, Victorians were very curious about other peoples, and places. They were also very religious and had a zeal for aiding and helping the (as they saw it), untamed populations to become civilised. This of course to our understanding is dreadful and very un-pc, but it was THEIR, world, it should never be re written or airbrushed just for the sensibilities of our time.