How I see it at this time of my life is:
JW's live with dual thoughts.
For instance in a talk, they'll go on about how GOD LOVES HIS CREATION but at the same time, you'll hear that when it comes down to the Great Tribulation, probably you'll be saved... Probably you might make it but God apparently is only going to save people thru the Great Tribulation as a group and not as individuals.
So now you have two opposing ideas. God loves me but won't, maybe, possibly save me. There are many things like this presented to JW's in all the talks and literature.
So it teaches you to divide yourself. It teaches illogical reasoning. It teaches you to make excuses for God. (He loves us so much but he has an important reason as to why he won't rescue me) So why not make excuses for yourself? And the Watchtower makes excuses for itself too and forces the rest to accept them, just as they must excuse God.
They also hold up Rahab the harlot as a good example of saving God's spys. She lied and saved the spies and herself. JW's are taught to accept lying is good when done for God.
And people being people (at least some) once they lie and get away with it - whether for something small or big - they will continue because it gives them some advantage. And that could be to get out of trouble, avoiding to have to explain themselves or even as in the case of my younger sister, to feel superior by tricking others.
I'm rather shocked to find after reading this blog for years, that many fudged their time etc. Because my father would break his promises, I found lying to be hurtful and didn't want to hurt others in the same way. So I didn't lie about even small things. The lady witness at work, has told me some things that shocked me. Lol. She told me she had gotten a jury summons but didn't want to go (neither did I but went any way because you were supposed to obey the secular authorities) So she did what the "wordly" guy at work suggested. Pretend it got lost in the mail. So she gleefully told me she didn't go. She and her sister, wanted to decorate a party they were going to throw. So they went and cut branches off of trees from other peoples yards. I said that is stealing. She just ignored me and called it something like An Adventure in Procuring. So she lied to herself about her actions. Yet, she gets all righteous about the Truth. She persists in doing these things even while admitting she has that fear of doing that one wrong thing at the Great T. But she doesn't see the previous acts as having any negative effect on how God sees her.
So to me JW's, unless they have their own internal brake on lying, will do so expecting to get passed on it, and will fight tooth and nail denying it unless you have absolute proof/and or a witness to their lying. Just look at their leaders....