No, literally: you can’t be too careful, or you may get in trouble.
In 2003, the Staten Island Ferry crashed into a pier at full speed, killing 11 people and injuring hundreds, because the pilot passed out; the pilot ultimately pled guilty to manslaughter. Victims and their families promptly sued New York City, which owns and operates the ferry. On paper, NYC had very tough safety rules, requiring two pilots to be in the pilothouse at all times, just in case; however, it turns out that this rule was not always followed.
On Monday, this abundance of caution came back to bite the city; a federal judge hearing the case held that the existence of these rules could actually be a factor in its liability (NYT):
The city had also argued that because its two-pilot rule was stricter than required by general negligence principles, the violation of the rule did not constitute negligence. In any case, the city said, individual crew members, not the city, were at fault.
But the judge, Edward R. Korman of United States District Court in Brooklyn, rejected those arguments. He wrote that by adopting the two-pilot rule, the city acknowledged a serious risk of accident if the pilot were incapacitated, and that knowledge of that risk required the city to remedy it.
In other words, the fact that at one point in time someone who worked for the city was extra-cautious actually works against the city; as soon as someone put down an idea about safety on paper, it became a minimum requirement rather than an option. (Trial lawyers already routinely use the existence of internal safety deliberations at a corporation as proof that a corporation knew about and ignored particular risks.) So what lesson do we send? Don’t adopt any rules beyond the absolute bare minimum; certainly, don’t put anything beyond this on paper.
(The judge naively pooh-poohed this risk, arguing that a “rational company” would be “far more concerned with actually preventing accidents than with gaming future negligence actions by carefully crafting its safety manual,” as if a company knew beforehand which accidents were “actually” going to happen.)
N.B.: I should clarify that the city may actually have been negligent in this particular instance; I’m critiquing the principle the judge espouses, rather than its application here.