Why vote Liberal when it means you actually support the Conservatives?

Ignatieff failing the middle class: Liberals offer no alternative or opposition to Conservatives | NDP

Michael Ignatieff and the Liberals can’t have it both ways. They
can’t say they are opposed to Harper’s agenda and do nothing to stop
it. Instead the Ignatieff’s Liberals are giving Harper a de facto
majority by voting confidence in him, time and time again, while
offering no alternative program of their own.

With the support of Ignatieff’s Liberals, Stephen Harper’s Conservatives have:

(Read on...)