I don't see it as wrong in and of itself. Lets not forget that there was a time in which God commanded man to not partake in meat- before the Deluge, it was law.
Therefore, God acknowledges that animals endure pain, but He also gave us the blessing of eating meat nonetheless. And not just meat, but also pork- an unclean meat, which the apostles partook in.
In Passover, the Jews actually attack every organ of the lamb simultaneously as to ensure an almost pain-free death. However, this is not commanded of us.