Quite the opposite, compared to the world before the "last days".
Immoral lynchings of blacks in the US have virtually stopped.
Immoral discrimination against women, even denying them the right to vote, has ceased.
Immoral child labor practices have been ended, at least in the western world.
Immoral pillaging of natural resources is restricted, and endangered species are protected.
Immorally corrupt business practices are regulated by various government agencies. And so on.
Or are you uber-narrowly restricting the term "immorality" to refer to horny young adults shtupping each other without the benefit of marriage?
If you define "immorality" as "sex outside of marriage", like the WTS, and ignore the dozens of other forms of ethical and moral violations that used to occur, well, yeah. Kids are as horny as ever, but now they don't hide it so much.