In the smaller technical world of ETL, we have a saying, "All data is suspect, some is just more guilty than the rest."
In the large world of real life, when you make decisions solely on data, you may open a broader can of worms. Not only is there bad data, falsified data, but "good" data and best practices is often ignored for political expediency. I can name dozens of political and society issues in todays world where data is intentionally cooked, overlooked, ignored or rejected. The great game we play called civilization is based partly on lies and ignoring truthful data.