So what makes one person think their particular interpretation is better than another person's?
Revelation of the truth comes from the Father, i.e., Jehovah. (Luke 10:21; please read John 20:17, then Psalms 83:18 ) According to Exodus 20:1-6, He is 'jealous': a person cannot gain His approval, if they're worshipping other gods. And that's exactly what the trinity does. It's not giving Jehovah sole worship, that He deserves. So, why would He grant understanding of His Word to ones who don't render devotion only to Him?
Let me ask you this: are you a father? How would you like it if your kids starting calling someone else, "Daddy"? You wouldn't. Neither does Jehovah.