Kindness

You mean the love it or leave it guys that need their guns to protect themselves from the government, which when other citizens take up arms against for political reasons, the love it or leave its call them terrorists. That kind of missing the point?

It's never that simple. The absolute answer is it varies by brand and product within brands. However, generally, flats have slightly higher tension than rounds and I believe (though am not certain) it is usually for the reason noted by JazzAd, the thicker core.