Decisions are needed
Management Decisions have been very important in every business that I've worked for - it's not so much how the decisions are made, or if any evidence, or reasoning is used to back them up - what's important is that Decisions Are Made.
Decisions justify Management - therefore it's vital that they are made ... because otherwise how would Management justify its salaries? Most of the time the Decision is made first and then they hunt around afterwards for the evidence to back it up - it's much easier that way.