Arguments against open science

People have proposed various arguments for keeping a certain amount of exclusivity in science.
Too much unsorted information overwhelms scientists
Some scientists find inspiration in their own thoughts by restricting the amount of information they get from others. Alexander Grothendieck has been cited as a scientist who wanted to learn with restricted influence when he said that he wanted to "reach out in (his) own way to the things (he) wished to learn, rather than relying on the notions of consensus."
Science will be used for bad things
In 2009 some people stole some scientists' email regarding climate research, starting the Climatic Research Unit email controversy. In 2011, Dutch researchers announced their intention to publish a research paper in the journal Science describing the creation of a strain of H5N1 influenza which can be easily passed between ferrets, the mammals which most closely mimic the human response to the flu. The announcement triggered a controversy in both political and scientific circles about the ethical implications of publishing scientific data which could be used to create biological weapons. These events are examples of how science data could potentially be misused.
The public will misunderstand science data
In 2009 NASA launched the Kepler spacecraft and promised that they would release collected data in June 2010. Later they decided to postpone release so that their scientists could look at it first. Their rationale was that non-scientists might unintentionally misinterpret the data, and NASA scientists thought it would be preferable for them to be familiar with the data in advance so that they could report on it with their level of accuracy.
Increasing the scale of science will make verification of any discovery more difficult
When more people report data it will take longer for anyone to consider all data, and perhaps more data of lower quality, before drawing any conclusion.