Nebraska lawmakers are considering legislation to ban law enforcement use of drone aircraft. I am torn between my libertarian and environmentalist impulses. As to the former, damn right I don’t want these things nosing around overhead, but as to the latter, I’m a little thrilled at the potential for drones to monitor illegal lawn sprinkler activity in Lincoln, perhaps even -- oh, God, please! -- armed with some light air-to-surface missiles to pinpoint offending sprinkler heads, leaving tiny, smoldering craters all over town.