He creates a straw man argument by refuting something that is not said . We do not say that nothing has changed in the last 100 years . That would be foolish. Mankind does indeed face unprecedented problems in the environment , population growth etc. . I personally deplore the horrible weapons of today and the amount of our money spent on them.
However.... these are the result of technology not a worsening of mankind's attitudes. There is no evidence that people today are intrinsically worse than in former times, they just have more opportunities to cause harm . There is evidence before our eyes also of a greater social conscience today than was held by our slave owning, child labour employing "hang 'em flog 'em" forebears.
Anyone who thinks that the Victorians were paragons of church going morality has simply not read social history, or indeed, looked into their family history. There was an awful lot of nooky going on I can tell you! , evidenced by the number of 'base born' children.
We all agree, we would rather live today.