This youtube channel has stuff up like “Why women destroy nations” or “Mass rape in Cologne Germany: Refugees still welcome!” There was never a “mass rape” in Cologne.
I don’t know what else to say than don’t inform yourself by watching sketchy youtube channels. Trulster’s advice is a start.
The Great Replacement and Defend Europe mission is propaganda by racists and Nazis. There is some German movement involved in latter which is under observation by the German equivalent of the FBI.
Yes, there is a big influx of refugees coming to Europe. Germany took 1 million of them in 2016. That’s 1/80 of the whole population. Don’t know how the refugees will replace the “German” people though. Whole Syria has only 20 millions. Still not enough to replace the Germans.
The US is the country that profited so much from immigration and is the embodiment of an immigration country. Look at your history and you should understand best how it works. Where is the German culture of the over 5,5 millions of Germans immigrating to the US? Not there, they assimilated. It is what most people do.