Yes, this is the original quote from Albert Einstein.
I tend to put it this way:
The world is dangerous not because of those who do harm but because of those who look at it without doing anything.
which seems to have a more balanced structure. However, I do observe the original quote conforms to common English usage (i.e. commonly used in newspapers, books, etc.).
I feel inclined to follow the language convention rather than make it subject to my own judgement.