I've been told by several keto adherents that saturated fat doesn't cause heart disease and that the vast amount of research showing an associating between saturated fat intake and heart disease is shoddy observational science.
They've told me that randomized clinical trials, unlike epidemiological studies, are actually reliable and have failed to show such an association.

They say red meat is actually good for you, for example.

Is this true or have they memed me? Are RCT more reliable and do they actually not show saturated fat to be harmful?