Actions > Talk. They were telling you their true views. People rarely say the quiet part(their views) out loud so it is valuable to be able to translate their actions into their true views.
When you know how others truly feel, it allows you to decide who is worth listening to. Not to say you shouldn’t listen to people with different views, but instead decide whether they are telling you their beliefs or telling you what they think you want to hear(BSing you) and use that rate how trustworthy they are on the topic.