That one always cracks me up - happens a lot with Christianity as well. Not sure about other religions but I guess often the same there.
I've not looked this one up in detail but I suspect it is like many things that are often misunderstood in Christianity and Islam in that the spirit of the relevant passages is related to greed but rather than take onboard the root message of the relevant passages people get all caught up in literal translation or at some point someone has misused the passage to slap it over something they disagree with and it has stuck down the ages, etc. etc.
I highly suspect if you look at the relevant text objectively the spirit of it doesn't prevent the use of a loan for purposes of education or general welfare, etc. but does prohibit the use of such in pursuit of worldly vanities or something along that line.