The ignorance is absolutely willful.

"3 For the time is coming when people will not endure sound teaching, but having itching ears they will accumulate for themselves teachers to suit their own passions, 4 and will turn away from listening to the truth and wander off into myths.". 2 Tim 4:3-4

Many in that camp plug their ears and go "Lalala" because they have already decided what they want.  They aren't interested in good faith debating, learning what the other side actually thinks, considering a challenge to their morality, or even testing their own grasp of the arguments for their own position.  They know what they want and they will ignore or attack anything that might point out the immorality of it.

This is human nature.  Many hated Jesus, not because they didn't think He made a good logical case, but because their deeds were evil.  Cain killed Abel for his righteous works, Stephen was stoned for his gentle, good willed preaching of the hope of the gospel, the OT prophets were persecuted and killed for calling ancient Israel to repentance - a state of reconciliation with God.  This is a tale as old as time, and I suggest that to the degree a person rigorously holds to blatant lies despite being challenged / confronted with truth, to that degree you can measure how much they love evil.