Alneyan! Eeeyuck!
What a horrid philosophy! Even at the worst of times I try to capture. Victory in itself is not enough for me; I must win the righteous way or it is meaningless.
IMHO there should be a penalty for glassing planets. No penalty for the first one each turn, 5% decrease in happiness to your own people for the second, 10% for the third etc. I know my honorable people would be horrified were I to start glassing planets as a matter of policy. I would be deposed in seconds!
Note: Don't even get me started on star destroyers!
(I don't even research Stellar Manip 8)
The nicest thing I can say about glassing planets is that it's gauche.