There are many synonyms that can be used to describe a "shred of human decency." Some examples include a hint of morality, a sliver of compassion, a fragment of integrity, a speck of honesty, a trace of empathy, or a particle of dignity. All of these synonyms represent a small amount of humanity that is still present in a person, despite their actions or behavior. It's important to identify and acknowledge these shreds of decency in others, as it helps us to connect and relate to one another on a deeper level. By focusing on the positive aspects of a person's character, we can build trust and understanding, even in difficult situations.