So finding the concept scary seems kind of pointless. However, I would, of course, rather be aware of my mistakes than not.

My actions have impacts on others. In general, I prefer to help other people or at least not harm them–however, I may harm someone by mistake, and I really don't want this to happen. If I make a mistake once and I realize it–fine, hopefully no harm done, I won't do it again. If I make a mistake and I don't know about it, well, maybe no harm done that time in particular, but I'm likely to keep making this mistake over and over, and possibly the first time I'll find out is when there is harm done. I think that justifies finding it scary.