The thing is, the bit of difference is actually quite a big difference. It's the difference of helping yourself by not hurting others and helping yourself by hurting someone else.

It's the difference between reading a newspaper you found on the street and reading it over a stranger's shoulder.

It's the difference between adding a few pieces during a game of chess against yourself and doing the same against someone else.

It's the difference between walking down a street and pushing someone aside to do that.

It's the difference between reading a book in the library and reading it in the bookstore.