Here I encountered the following sentence:
However, most people understand their side is good and the opposing side is bad, so it’s much easier for them to form these emotional opinions of political parties.
This sentence features a misuse of 'understand.' 'Understand' is a verb of success. If you understand something, then it is the case. For example, if you understand that both 2 and -2 are square roots of 4, then this is the case. Otherwise there is a failure to understand. 'Understand' in this respect is like 'know' and unlike 'believe' or 'think'. My knowing that p entails that p is true. My believing or thinking that p does not entail that p is true. My understanding that my side is good entails that it is. The above sentence should read as follows:
However, most people THINK their side is good and the opposing side is bad, so it’s much easier for them to form these emotional opinions of political parties.