Ever wonder what "stumbling block" means, like really means in our daily modern day lives?
Advising your brother or sister in Christ that it's 'ok' to do the wrong thing. To choose not what the Word of God says, but what the world says is 'right' or telling them 'you need to do what's best for you'.
Everyone is responsible for their own actions, but we are each accountable for the advise we give others.
Our advice... our consent... are those very stumbling blocks the Word refers to.