I don't agree with this. What does it mean by "good people to do evil thing"? If you commit 'evil' actions you're not a good person.
Is it talking about how they justify the action to themself? If so that's something done by every single person. Every individual motivated by any ideology believes what they're doing to be good.
Some things are demonstrably worse. Wages/income equality being one of them. Economically we are regressing more towards serfdom than the other way. At least we can choose our masters this time.
If you mean violence only, then yes times are more peaceful than ever. If you mean on the whole. I wouldn't be so quick to agree with your assumption.
https://en.wikipedia.org/wiki/Gini_coefficient#/media/File:Gini_since_WWII.svg
Far more complex than "demonstrably worse". It has gotten worse in certain countries and better in certain countries. This also doesn't include any of the african of many of european/asian/american countries where life has greatly improved and it has gotten better. This chart is also only since WWII which is far better than what it was during the middle ages. There was no concept of social mobility during middle ages.
Social mobility and economic inequality are only few of the metrics that help quantify the quality of life. It doesn't tell the complete story. Even though the income disparity in China or UK or US has gotten worse since the last 50 years, the quality of life overall has gotten significantly better.
So while we might not be getting better in every single aspect everywhere in the world, as a whole life today is far better than any time in history.