I'm sorry, are you arguing that not forgiving governments, elected officials, and people in positions of power and authority (or those seeking such power) is a problem in our society? Like, the US, the country that elected Trump, is having a problem with forgiving/forgetting past transgressions?
> but there are far more reasons to forget.
If there are that many, why didn't you name them?
> If this was the case everyone would hate everyone.
Hate isn't the issue. We're talking about real world problems with consequences. Evil doesn't just go away because you forgive it, people who are harmed are still harmed, and costs incurred need to be paid. If you just forgive and forget naively, that means the people who are hurt just keep paying, over and over. And the people who take advantage of it just keep winning forever.