I don't feel like we have a responsibility to take in every single immigrant who wants to be here and have not said that at all. But, we do have a responsibility as people to highlight where echo chambers are whipping up a frenzy and those with short memories fail to accept the countries responsibility for it's past.
People migrate here either here on work visas and are therefore required to do a job noone in the country can or will do, are on a family visa and supported by someone earning enough to do so, on a student visa paying higher fees that allow British citizens to pay less, one of the much smaller numbers on other visas including those tied to historical ties or seeking / given asylum.
Those are the ones that we do have a moral responsibility to accept when they meet the requirements for asylum. And the rest overwhelmingly have an economic benefit for us.
Only about half asylum claims are accepted. And they account for 10% of the total population growth in the past 10 years.
As for causing social and civil unrest due to clashes in culture and the like. Yes, there will be instances of immigrants, both legal and illegal commuting violent crimes. However, the overwhelming perpetrators of violent crimes in this country are white men and there are increasingly worrying Incel movements affecting young men and boys attitudes to women.
The violent clashes caused by Britain first style marches caused by certain media outlets whipping up a frenzy, funded by right wing lobbyists, has been far more concerning and damaging to this country in the past few years than asylum seekers. If you are concerned about civil unreast the call is coming from inside the house.