They were made to cut grass. Back when there was no tractors or lawnmowers people used scythes. I'm not sure how they got associated as a weapon, or with death. Maybe people thought the god of death "harvested" the souls? Ah, but it doesn't work like that.

[Shiemi gently sets the bottom of the staff on the ground, and the top half - where the blade is - against her shoulder. She doesn't want to risk fumbling what is precious to Shu. What might hurt him more than he may already be hurting. She wraps her arms around the Void, holding it careful and close. All Shu needs to do is ask, and he can have it back.]
So maybe your heart isn't so hurtful? Maybe if used right it can be helpful?