Why do people ignore evidence or fail to appraise the evidence from organizations and other sources correctly?

Despite the availability of evidence, some people have dismissed the evidence, or behaved in ways that are counter to what the evidence indicates. For example, some people have chosen to have large gatherings and meetings, while a group of University of Texas students chartered a plane to Cabo San Lucas for spring break in March–and 44 of the 70 students have now been sickened by the coronavirus. Why do people ignore evidence or fail to appraise the evidence from organizations and other sources correctly? What possible things could be done to help people accept and use evidence?