First you said matan Torah and bayis sheini. I was addressing that.
As far as anti semetism yes it is always brewing and an outburst could happen today in America cvs if Hashem didn’t protect us…
Esav sonei lyaakov and the won’t be a complete end to anti semetism until moshiach comes.
That being said there are more Chassidei umos haolam today – there are whole movements of christians United with usual and Jews against anti semetism than ever before – there are also even bnei noach today.
Kindness is valued in the world today whereas it wasn’t in past times. As far as the cossaks etc – yes our Avodas Hashem, Torah and mitzvos has continued to refine the world since then, and bh it is much better.
As for Nazi Germany – the nazis yemach shmom also prided themselves on kindness, education etc on being civilised, but when it came to the Jews, all of a sudden none of those values applied.
But even then the world valued civilised behaviour even as it allowed incredible anti semetism to happen, as it would today if it was allowed.
Moshiach will fix this of course, but today the difference between the world now and eras past is that the world today world be happy to serve Hashem with moshiach as the ultimate civilised, G-dly leader, leading the way.
The days where cruelty, paganism, and even immorality were ideals to uphold are far gone.