Pave The Road To Hell Meaning

(idiomatic) to lead to a disaster by acting with good intentions

Example: 2015, The Boston Globe, Steven Pinker, The moral imperative for bioethics:
  In the other direction, treatments that were decried in their time as paving the road to hell, including vaccination, transfusions, anesthesia, artificial insemination, organ transplants, and in-vitro fertilization, have become unexceptional boons to human well-being.