"They also like to pretend away the reality that if you cause another to sin by your actions, you bear guilt for that sin."
Where the heck is that in the Bible?
Several places. For a start, Jesus warned about it:
Matthew 18: 1-14, especially note verse 7
1: At that time the disciples came to Jesus, saying, "Who is the greatest in the kingdom of heaven?"
2: And calling to him a child, he put him in the midst of them,
3: and said, "Truly, I say to you, unless you turn and become like children, you will never enter the kingdom of heaven.
4: Whoever humbles himself like this child, he is the greatest in the kingdom of heaven.
5: "Whoever receives one such child in my name receives me;
6: but whoever causes one of these little ones who believe in me to sin, it would be better for him to have a great millstone fastened round his neck and to be drowned in the depth of the sea.
7: "Woe to the world for temptations to sin! For it is necessary that temptations come, but woe to the man by whom the temptation comes!
8: And if your hand or your foot causes you to sin, cut it off and throw it away; it is better for you to enter life maimed or lame than with two hands or two feet to be thrown into the eternal fire.
9: And if your eye causes you to sin, pluck it out and throw it away; it is better for you to enter life with one eye than with two eyes to be thrown into the hell of fire.
10: "See that you do not despise one of these little ones; for I tell you that in heaven their angels always behold the face of my Father who is in heaven.
12: What do you think? If a man has a hundred sheep, and one of them has gone astray, does he not leave the ninety-nine on the mountains and go in search of the one that went astray?
13: And if he finds it, truly, I say to you, he rejoices over it more than over the ninety-nine that never went astray.
14: So it is not the will of my Father who is in heaven that one of these little ones should perish.
Mark 9:38-48, particularly note verse 42:
38: John said to him, "Teacher, we saw a man casting out demons in your name, and we forbade him, because he was not following us."
39: But Jesus said, "Do not forbid him; for no one who does a mighty work in my name will be able soon after to speak evil of me.
40: For he that is not against us is for us.
41: For truly, I say to you, whoever gives you a cup of water to drink because you bear the name of Christ, will by no means lose his reward.
42: "Whoever causes one of these little ones who believe in me to sin, it would be better for him if a great millstone were hung round his neck and he were thrown into the sea.
43: And if your hand causes you to sin, cut it off; it is better for you to enter life maimed than with two hands to go to hell, to the unquenchable fire.
45: And if your foot causes you to sin, cut it off; it is better for you to enter life lame than with two feet to be thrown into hell.
47: And if your eye causes you to sin, pluck it out; it is better for you to enter the kingdom of God with one eye than with two eyes to be thrown into hell,
48: where their worm does not die, and the fire is not quenched.
49: For every one will be salted with fire.
50: Salt is good; but if the salt has lost its saltness, how will you season it? Have salt in yourselves, and be at peace with one another."