The club (as constituted) hasn't raised it, the supporters of the club have raised the money and supporters from other clubs. That is amazing, and a huge achievement, but means little if the owners of the club, as opposed to the supporters, aren't going to use it appropriately and to ensure we can continue to enjoy success on the field - i.e. by selling our best young players to raise the next £500k (as reported by a well respected journalist after speaking to the present Chairman.

To extend your metaphor a firefighter wouldn't put out a fire and then hand a can of petrol and matches back to the arsonist who had just torched the place.

So why do we urgently need £1m?

To get through to November

But there are two problems - getting through to November is certainly one, but to assume because a business plan balances everything will be fine is naive in the extreme and lets face it hardly any business plans see the light of day which aren't good. The problem is while the costs next year are pretty certain - there is always less certainty about income and those little or not so little skeletons which com out of the Bulls cupboard, you need to have some contingency apart from begging from the fans.

The costs are controllable as the vast majority are football related.
Forecast income can be based upon many things that may or may not be certain, naivety would be for the club to forecast the uncertain, which I am sure they would not, after we have committed our hard earned cash to the pledge.They will need to cut their cloth to their forecast "guaranteed" income rather than being overly optimistic.
Just my assumption.

Positive looking cash flow forecasts and business plans are also useful tools for encouraging external investment, for example if you were wanting to shift your shares in a business.

It's up to the buyer to be able to spot any potential flaws or holes in the logic.