Why is it important for law enforcement administrators to study the future?How will the study help them?

Public Policy Analysis.

You
might speculate about the future, based on your study of and knowledge of the past.  Not
possible to study the future.  But based on knowledge of the past it is possible to make
some educated guesses about the future, and thus have a plan for if they come to pass. 
Those plans would have several options for the several possible future events that might
happen based on what has happend in the past and on what current conditions are that
might provoke or catalyze certain events with some probability that is large enough to
make planning for them worthwhile.  A plan enables training programs to be developed for
skills that are likely to be needed. enables resources to be acquired and positioned
where they are likely to be needed.  Based on the educated guesses, will more or less
manpower, automobiles, tactical weapons, other resources be needed?  If it is guessed
that less of A will be needed, can part of the budget for A be reallocated to procure
more of B, where it is thought that more of B will be needed?  With a good solid plan to
show to the legislature, it is more likely that projected budget changes can be
approved, than with no plan.  With a good solid plan in place, it is more likely that
the law enforcement needs planned for will be met and accommodated successfully, than
with no plan.  There will always be events and occurrances that were not foreseen and
not planned for.  But the habit of planning will make it more likely that even the
unforseen will be met successfully.