No "if" about it Nigel - the overwhelming conflicts that have caused the refugee crisis are traceable back to oil
That doesn't mean they are traceable back to UK.

Even if none of this were true, we would have a moral obligation to assist less fortunate countries - that was the Britain I was born to and lived in most of my life

Funny, I just said that, maybe you missed it because it doesn't fit in with your world-view:

For many of these immigrants we are not part of the cause.
That doesn't prevent us providing humanitarian aid, whether we are a part of the cause or not.