Repentance is the commandment of the times. Disciples are told to prepare for it and to prepare others using all gifts and talents faithfully and actively. Those who sin against revealed light with their eyes open, against the Lord's words, can expect, in this world or in the world to come, a penalty proportionably severe.
Hypothetically, if you made a taco and shaped it into a taco bowl shape and while you were baking it, the taco refused to stay in the bowl shape and the resulting mess was incapable of being used as a bowl to make a taco salad, what would be an appropriate response for you, the chef, towards a worthless, useless non-taco bowl? When mine overcook, I throw them away. They are good for no other purpose.
When the omnipotent, omnicient, omnipresent creator makes a being that rejects him as creator, refuses to offer the honor that God deserves as creator, rejects the mercy that God offers, and ultimately proves unsuitable for any purpose that would glorify God except as an object of His wrath, what is the proportionally severe penalty for rejecting the infinite love of the infinite creator and choosing to rebel against Divine authority instead?
Responsibility in the House of God isn't something to be taken lightly so that's for stewards and also for those who hear the word. In a way ignorance is bliss but anyone into the word shouldn't be among those not knowing and not doing.
An interesting question about ignorance being bliss. Let's test that theory out. Jesus said (Matthew 5:27-28) "You have heard that it was said, ‘You shall not commit adultery.’ But I tell you that anyone who looks at a woman lustfully has already committed adultery with her in his heart."
So my question is, under the Law of Moses, was God OK with men staring at women with lust in their heart and it only became a sin that God was going to hold men accountable for after Jesus delivered the revised Law? Or was it always an offense against God and a stench in His nostrils, and Jesus just let us know the true depth of our sin problem with a Holy God?