The seven deadly sins are all things that have a serious negative impact on you and your life if you give into them too much. They’re all very general habits/feelings/desires that most people feel/experience which can lead you to hurt yourself and/or others, and haste/impatience checks both those boxes.

And I suppose as “sins” they’re supposed to lead you to do “un-Christian” things, but impatience probably does that more than sloth, right? Like you’re much more likely to hurt yourself and/or others if you do things fast without thinking than you are by just sitting and doing nothing all day.

I guess all of the sins are also all some form of carelessness too which also applies to being hasty or impatient.