I've found that sometimes the things God asks us to do seem to us irrational, and even at time contradictory to our understanding of what would be best. But trusting His understanding above our own is a huge step towards spiritual maturity. I think we'll see something of this from both Harry and Snape before the series ends. Perhaps Harry will have to trust Dumbledore by trusting who Dumbledore trust...namely Snape.

Yes. Yes, yes, yes!! Exactly! Regardless of how everything to do with the Lightning-Struck Tower plays out in the details, this I expect to see.