Tempest (1) - S1-E21
Continuity mistake: The way the pillar is on top of Lionel changes in the scene. In the first shot, he's on his side and it lands on his hip. In the next shot he's now on his back and the pillar is going somewhat across his body. In the wide shot of him as the roof falls, the pillar is below his belt, almost perpendicular to his body. Then back to being on his stomach and part of his chest.
Answer: He still had a compassionate side, the donated blood was for people who had blood diseases. The reason he did all this in the first place. As for animal blood, that's only for undead vampires, he was a living vampire, who needed specific fresh blood to combat his disease. Plus, vampires drinking animal blood was made up in movies and TV shows.