They have no natural affection.
And if they had any residual love left over the borg systematically takes it away.
You aren't allowed to do any of the normal things to show your children you love them. Such as Xmas and the birthday restriction is beyond ridiculous.
Yea I'm sure Jehovah put those examples in the bible to warn you against celebrate the miracle of birth.
I'm pretty sure those scriptures are better explained with a Dave Barry quote:
"There comes a time when you should stop expecting other people to
make a big deal about your birthday. That time is: age 11."
And you spend your whole time in the borg being suspicious of everyone.
I was always afraid to get close to anyone, I knew that any day I might be told never to speak to them again.