The biggest issue of the Watchtower's teachings, is their rejection of the Central Doctrine of the Holy Bible, which is the very Nature of Almighty God, Who exists eternally in Three Persons, Father, Son and Holy Spirit; coequal, coeternal and coessential. None of the examples given in the OP will send any soul to hell, but the rejection of the Holy Trinity, and Deity of the Lord Jesus Christ and the Holy Spirit, most certainly will do. Jesus Himself said:
"Therefore I said to you that you will die in your sins; for unless you believe that I am He, you will die in your sins." (John 8:24). He is of course referring to His own Deity from Exodus 3:14, where He told Moses, "I am Who I am", or, as the Greek LXX puts it, "I am the Eternal One".
Nothing else really matters!