The horrible horrible Bloc veto

I'm having a little trouble understanding why criticism of the coalition involves the BQ having a "veto". Surely the criticism should be more along the lines of the Coyne idea that the BQ will demand some concession that the other parties won't be willing to give, and this leads us to believe that the coalition is unstable. Really, if the NDP and Liberals create a piece of "good" legislation that the Bloc doesn't like and won't support, the Conservatives are always free to pass it.

As an absurd example, say that space aliens invade Western Europe, plunging us into war due to our NATO obligations. The fighting is fierce, and the coalition decides that a draft is necessary. The Bloc, however, is against the draft and threatens to veto. Well, presumably the Conservatives would support such a draft, and the legislation could pass over the objection of the Bloc. So operationally the Bloc doesn't have a veto over decisions that the federalist parties (in fact even just the Liberals and Conservatives) can agree are in the best interests of Canada.

We have a minority government, and in order to work the parties are going to need to compromise. Harper has shown absolutely zero willingness to compromise, so it's time for someone else to give it a shot. The Liberal-NDP coalition is free to try to produce bills that the Conservatives will be able to vote for, and indeed given their minority mandate they ought to. It's only if the Conservatives will simply vote "no" on anything and everything that they will need to resort to Bloc support.