They decide that a person who is intentionally false must be "better" than a person who is unintentionally false, on the basis that someone who lies intentionally must understand the subject about which they are lying.
ðeɪ dᵻsˈaɪd ðˌæɾə pˈɜːsən hˌuː ɪz ɪntˈɛnʃənəli fˈɔls mˈʌst bˈiː "bˈɛɾɚ" ðˌænə pˈɜːsən hˌuː ɪz ˌʌnɪntˈɛnʃənəli fˈɔls, ɔnðə bˈeɪsɪs ðæt sˈʌmwʌn hˌuː lˈaɪz ɪntˈɛnʃənəli mˈʌst ˌʌndɚstˈænd ðə sˈʌbdʒɛkt ɐbˌaʊt wˌɪtʃ ðeɪ ɑːɹ lˈaɪɪŋ.