Just like in China and India which suffer from increased violence where men are many more than women, Europe will have to face the problems of non-European male incoming migration, as the marriage market will deteriorate quickly.
When the ratio exceeds 120 men for 100 women, things will escalate quickly. It’s only a matter of time since in Germany, the ratio is already 115 men for 100 women in the age group that is looking for marriage.