If you are giving your time and devotion to a religion, you want to make sure that it isn't wasted time and devotion. A religion is a construct built on a foundation of beliefs. If those beliefs are wrong, it doesn't matter how nice the memebers of that religion are, you are devoting your time and devotion to a lie.
When that religion imposes a set of restrictions that make you different and segregate from the rest of society, and in addition some the rules could cost you your life, it's foundation had better be firmly based on truth.
The JW-cult is NOT based on truth. It has been proven to be a fabrication of lies and deciet and imposes restrictive rules that can result in a loss of life. To die for a pack of lies is indeed a waste of life.