Violent crime by all measures are at generational lows. It's just the truth.
I was being hyperbolic because OP was being ridiculous too. To say "your country opened the doors to rapists and violent murderers" is a very specific right wing scare mongering talking point that is easily debunked by any semi-serious human that can read an x,y plot of the data.
Also, events that are occurring today indeed are interdependent with events of the past [1] -- the crimes of genocide and slavery affect all humans that descend from it [2], and those humans interact with all of us in the here and now. And we are all of course affected by events that are occurring today. Both are true.
It's not that hard to see when you open your mind and look a little deeply. Or in the words of a great sage, "free your mind and your ass will follow". [3]
[1] https://www.lionsroar.com/buddhism/interdependence/
[2] https://en.wikipedia.org/wiki/Transgenerational_trauma
[3] https://www.youtube.com/watch?v=9zZfbkUkodY