But dont you remember? No animals ate meat before the flood. All of that is only nessesary to ensure survival of the species untill the New Order! Right? Um, you know, sharks ate only sea plants, snakes ate only small pebbles, and lions, well those teeth were suitable for chewing up large tree trunks.
Obviously, the earth was much different then. There was far more vegetation, but Noah couldn't save all of that could he? And Jehovah was in his day of rest, well, day of rest from creating anyway (there was plenty of time for destroying and that is kind of like recreation anyway), so he could not just recreate those missing species of plants. Besides the giant cloud that covered the earth was gone and now the climate is different.
So to answer your question, it is not Jehovah's fault. It was humans who caused God to have to kill them and wreck the perfect plan for a worldwide garden. It's all in the Bible you know.
P.S. Don't forget about mosquitos. They used to suck sap from small seedlings before they had to resort to blood.