If we followed this simple principle, wouldn't there be a lot less violence and crime?

yes, but there are so many people with a warped view of what love is. I come from a culture where parents beat kids and say that if the parents didnt love the kids, they wouldnt b beaten; they'd b set free. To me, that's manipulating scripture. But to the elders of my culture, by beating kids into submission, they're following St. Paul's scripture passage above. But in literal answer to ur question...yes there would b.

No there wouldn't be less violence or crime because there is always one who will not live by the Principle in Romans 12:10

Only problem with that is life isn't simple. It's a complex system of nature that seeks to balance. for every good action comes a bad action. This is also known as karma and it does have proof.

What is the point in writing something that is so banal because it could never work.

You might just as well say: "Give unto everyone an equal share that poverty may be no more".

Aggy 14:9

Absolutely, but sadly this is not a principle that many people live by.

How about:

Do unto others as you would have them do unto you.

Common Effing Sense 1:01

tell that to christians in africa who pour concrete down the throats of gay people

and kill children with learning difficulties for being posessed by demons

just tell a homosexual how he is contributing to the corruption of our children and see how much hatred they have towards those who do not condone their behaviour.

then why does the bible preach homophobia, slavery, mass military conquests against the non-believers etc? why did god send plagues, world wide floods and natural disasters in the bible?

Yeah, it's called practicing what you preach, and most Christians have no idea how to do that.