Why should we be defined as the worst thing we’ve done?

I personally don’t think it’s acceptable to define someone solely for their worst decision. It’s different if they have lived their lives solely doing bad. But if some has done something wrong even if it’s heinous then dedicated their lives for the better. Lived their lives in sole of helping others then they should not be defined by the worst thing they ever done but instead defined by the good and the bad.
Why should we be defined as the worst thing we’ve done?
Post Opinion