I agree to the fact that love conquers all. By "love" I'm going to define it as a genuine desire to put someone else's good above your's, to achieve what is best for them. This is the same love God showed us when He sacrificed His son for us. He wanted His Son to remain in heaven, but He wanted our good more than His desires, and then sacrificed Him for us. By ''conquering all" I'm going to define it as two people working together to bring about the good of each other, irrespective of the conditions they find themselves.
I'd say that if both people are truly in love with each other as we have described, then love will surely conquer everything.
I have tried a lot of times to put myself in God's shoes. To sacrifice your son for people who love you is on a level. To sacrifice you son for people who don't know about what you are doing is on another level. But to sacrifice your son for people who are your enemies is on the highest level. That's the greatest kind of love ever, and that's what God did for us. He sacrificed His son for us while we were yet sinners. That brings tears to me eye, making me wonder why people would chose not to accept this sacrifice and love this loving God.
When God says He is the definition of love, this act of His gives Him the right.
I can't even imagine the pain God felt when sending His Son to be sacrificed. It pleased God however to crush Him on our behalf.