The premise of being a single-issue voter is often met with condescension. As if only a simple-minded person would think so narrowly. Especially if the single issue is protecting those not yet born.
There are other issues to consider; to be focused on one issue may appear clueless. Clueless to the fact that the rest of the living world has to deal with injustice, inflation, international wars, poverty, hunger, and limited housing options. The long list of concerns goes on and on. Important issues, which matter a lot.
But only to the living.