I think sadness is the ugliest feeling. The feeling of having a lump in your throat and being negative can be quite horrible. Pride, envy, greed etc can be disgusting but sadness is a lot more intense.
When you aren't happy inside, it reflects this insecurity in other forms such as envy, pride, ego, greed, etc. The worst feeling is when you look down upon yourself and be sad about it. I did feel guilty for losing someone sometime ago but I don't think I can be sad for a long time.As rondata said guilt is a wasted emotion. Things happen for the good and no matter what, you always have the right to be happy.
Smiling, laughing and having an appreciation for things around you and making the best of it, looking forward with ambition and being good to yourself and the people you love will keep you happy.
We wouldn't be human if we didn't experience all of these at one time or another. My worst feeling in my life is obviously sadness for the people close to me that I've lost. I feel guilt is a wasted emotion.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.