Decisions can never be made logically. Logic can, at best, help you identify the obvious choice.
When any alternative in decision making seems logically better than the others, the choice is obvious. E.g. the alternative ways of going up to the 15th floor of a building is to take the elevator or the stairs. Taking the elevator definitely seems to have more logic, hence the choice is obvious and no decision is required.
Real decision making is required when the alternatives are logically similar. Consider that you are getting late for your flight, and there are two routes that you can take to the airport. Route A is much longer but is likely to have less traffic, whereas Route B is shorter but is likely to have much more traffic. Both routes have their positives and negatives. Whichever route you choose, there is a risk of missing the flight, either due to distance, or due to traffic. It is not possible to make a logical decision on the routes as both routes seem equally risky.
Clearly, decision making is required only when all alternatives have logically equal risk and/or benefit. Hence you always have to rely on your Gut Feel to make the decisions.