Please, provide examples of heritage and/or colture being used for the betterment of society.
Protip: you can’t.
Heritage and colture are frozen in time and will never be used to improve society because they need a strict set of boundaries to remain heritage and colture. Should a colture be poisoned by external factors it would immediately cease to be the same culture it was a minute ago and would become something different, thus being rejected by those who practice said colture in a religious way.
To make a simpler example you may be able to understand: I am Italian. The thing italians hate the most is ananas on pizza because “this goes against our culture!”
Should I dare to say that I enjoy ananas on my pizza tomorrow (I don’t, but that’s what a thought experiment is) most of my friends would be appalled by my statement and would fight me on that.
Culture or heritage intended as a set of characteristics stereotypical of a certain subset if humans are a cancer to society and should be eliminated.
Your examples paint you as awfully convinced that foreigners are completely incapable of integrating into a new society. That’s pretty bigoty. People can participate in multiple cultures. They can pick and choose and blend them.
Of course they could become European, should they decide to leave their culture behind and to homogenise in the society they live in. Unfortunately peer and societal pressure do not allow for such a change and therefore they are doomed to remain marginalized because they cannot accept their culture, heritage or race not being “the best”