Yes Bush isn't president, but the failures and hatreds of the entire Bush family are still incredibly relevant today. If you don't believe that, look at the 10s of thousands of Afghans currently walking through Iran and Turkey to find refuge in Europe).
When you're the leader of the most powerful nation in the world, your decisions outlast your position.
I think the refugees are motivated much more by the financial incentives those governments provide. They usually pass through multiple safe countries to get to places like Germany. A modernized Plantation of Ulster has been the policy of every Western government since the 60s.
War and, I guess, the weather, are convenient narratives for these highly unpopular policies.
When you're the leader of the most powerful nation in the world, your decisions outlast your position.