Not sure now, but probably 'hate'.
The absence of hate is love, and love is literally the greatest ever.
It is the too many hate that we have today that keeps resulting to unnecessary wars, manipulation, corruption, oppression, intimidation, and so many things that don't just feel right. I was asking the other day, why does a certain country feels it is okay for other countries to pay a fee for every imported item, but feels it is disrespectful for them to do the same.

Corruption should have been the primary thing though, but I think the elimination of hate can fix it.