What is the ruling on weak Muslims and Muslim communities in Europe following the fatwas of some Egyptian scholars that permit dealing with usurious banks, and is there a definitive refutation of the specious arguments of these scholars?

The prohibition of usury (riba) is widespread among Muslims, and no fatwa (definition) permitting it can diminish this. God's judgment cannot be altered. No one is allowed to engage in usury based on such fatwas, for sin is what wavers in the heart and causes uneasiness in the breast, even if people give you a fatwa.