The 4 Wise Monkeys

So we all know of the 3 famous ones right? 'See no evil' , 'Hear no evil' and 'Speak no evil' ? Right. So it turns out we have been ignoring one of the monkeys. Which I am sure you all will figure out WHY that may be..... since the 4th monkey's advice is 'Do no evil'.... and judging by where his hands are....we know what it implies. Now the implications vary. Some would say it doesn't mean 'ever' ...it means the times when it is wrong. Others argue that the other 3 monkeys mean 'don't do it ever' , then why would the 4th monkey have an exception?