Problem: Raiding the homes of goblins and other creatures with families, perhaps even murdering their babies, just to take their treasure, strikes many people as just plain wrong. I've read at least two posts today talking about this, and it's been a topic of long debate.
Consideration: Way back when, goblins, bugbears, and other such things didn't have families, but were more like monstrous plagues, sometimes spawned by parthenogenesis, like horse hairs in water troughs turning into snakes. You could have goblins reproduce by stealing children abd twisting them with magic... but that still leaves a feeling of goblins as victims.
Suggestion: Goblins -- perhaps all monsters -- are not the result of natural life processes; they are created by Monster Summoning spells. Give a small chance that monsters created by such a spell do not disappear when the spell ends, but merely flee into the wilderness to find their own lairs. Intelligent creatures like goblins figure out ways to summon more of their own kind, but their numbers (fortunately) are still small. Monsters are rare, but dangerous -- and unnatural.