Indicators only indicate:
an indicator will never completely capture the richness and complexity of a system. This makes people nervous that they will be judged unfairly on the basis of only one (or a few) facts.
A set of indicators will usually not improve things much. Indicators are designed to give ‘slices’ of reality. They might provide the truth, but they rarely give the whole truth. This leads to people’s understandable fear that they are being unfairly measured and judged. Like any reductionist approach, an indicator must be understood in context.