2 razors

Hanlon's Razor is a mental shortcut which teaches us, in the words of Robert J. Hanlon to "never attribute to malice that which is adequately explained by stupidity." In other words, rather than questioning people's intentions, question their competence.

https://thedecisionlab.com/reference-guide/philosophy/hanlons-razor

It reminds me of Occam's razor - "The simplest explanation is usually the best one." Also known as the principle of parsimony, it is the problem-solving principle that recommends searching for explanations constructed with the smallest possible set of elements. 

https://en.m.wikipedia.org/wiki/Occam%27s_razor