Lore just simply seems to lack motive and reason.
Not necessarily. The Crystalline Entity feeds on living matter.
Lore is an artificial lifeform.
He may have had a grudge against organic life, due to the fact he was set aside by his human creator.
Which is another 'Huh?' A silicon-based lifeform feeds by consuming organic - ie, carbon/water-based matter?
The process is not quite like "eating" as such. The Entity is apparently able to convert any organic life in to energy which it then uses to sustain itself.