If you think about it, liberals think life (human or otherwise) is more important than wealth. Conservatives think wealth is more important than life. I know, this is a drastic oversimplification, but I've proposed the following hypothetical to a few hardcore conservatives, and it's telling, you should try it:
Say you are the CEO of a large corporation that manufactures something, say, widgets. You're building a new widget factory, at a cost of $11 billion. That $11 billion includes pollution and emissions controls, which cost $1.5 billion; if you left them out, the factory would cost $9.5 billion. The projected return on your investment is the same either way, so if you elect to leave out the pollution and emissions controls, that $1.5 billion is pure profit.
The catch, however, is that leaving out those controls means that X number of people will die (start at 1000, and keep raising it until they flinch). Of the few people I've tried this on, all but one opted to leave out the controls and make the extra $1.5 billion profit, until a ridiculously high number of people got killed (hundreds of thousands).
This is a hypothetical, but it's a decision that real corporations make all the time, and the results are often disastrous.
A nifty followup to this is, divide the profit by the number of deaths they're willing to tolerate, then take that per-head figure and ask if they think it's OK to have an abortion if you're willing to pay that much.