4% is within the established margin of "people who answer polls with seemingly completely random answers". Studies have shown between 3% and 12% of survey respondents don't think at all about their answers (sources: www.sciencedirect.com/science/arti..., pubmed.ncbi.nlm.nih.gov/22506584/).
Caring about carelessness: Participant inattention and its effects on researchThe current studies examined the adverse effects of inattentive responding on compliance with study tasks, data quality, correlational analyses, exper…www.sciencedirect.com