Brandolini's Law

The amount of energy needed to refute bullshit is an order of magnitude bigger than that needed to produce it.
     — Brandolini’s Law

According to Wikipedia:

Brandolini’s law, also known as the bullshit asymmetry principle, is an internet adage coined in 2013 that emphasizes the effort of debunking misinformation, in comparison to the relative ease of creating it in the first place.