I don't think bad decision making being fixable is "highly debatable", plenty of examples of college QBs improving on that skill coming into the league. Patrick Mahomes had 25 INTs his last 2 years at Texas Tech, more than Love had his last 2 years (23). Ben Roethlisberger had 21 INTs his final 2 years. Matt Ryan had 29 INTs his last 2 years, 19 in his final year alone. Eli Manning had 25 his final 2 years. DeShaun Watson had 30 INTs his final 2 years. Carson Palmer had 40 INTs over his final 3 years of college. The flip side is that Jamarcus Russell had 17 INTs his final 2 years, Paxton Lynch had 13, Brady Quinn had 14, etc. The point isn't to say INTs are no big deal in college, but context is critically important and bad stats don't always follow you to the NFL. It's a clean slate for the most part and success relies heavily on coaching, team situation, and the individual player's temperament and skill.
We know they're trying to build a strong run game and defense to take pressure off the QB position, so Love almost certainly will not be put in a position to do it all alone. We know nothing of LaFleur's ability to develop QBs but guys like Matt Ryan credit him with their development and success when they crossed paths, but right now that's a question mark. Love certainly has the physical skill and it's not unreasonable to be excited by what he can bring to the table. Does he have the IQ and attitude to be a franchise QB? Big question mark as we have never seen him on an NFL field, but college INTs are historically not indicative one way or the other.