"Názory nejsou fakta."

Translation: Opinions are not facts.

[psfinaki]

Why not "fakty"?

[VladaFu]

It comes from Latin sing. neuter "factum", plural "facta". In the other direction we do accept "fakty".

Compare http://prirucka.ujc.cas.cz/?id=faktum&ref=fakt with http://prirucka.ujc.cas.cz/?id=faktum&ref=faktum