This isn't 'some bad data' vs 'no data' This is 'some bad data' vs 'systemically biased data' and the latter is much worse. Most datasets will contain some bad

This isn't 'some bad data' vs 'no data' This is 'some bad data' vs 'systemically biased data' and the latter is much worse. Most datasets will contain some bad data but it can be worked around because the errors are random.