I think this is a common misconception about how electability works in a first-past-the-post voting system. There is no benefit to going with a compromise position or reaching out to moderates. The number of people who can be persuaded to vote one way or another is miniscule. The number of people who can be persuaded to vote or not to vote is massive.
If people are excited or scared, they come out to vote. With disenfranchisement primarily focused on progressive and minority voters, there's not much left to gain in scaring regressive conservatives more, they already vote at high numbers.
While the last part about voting (being persuaded to vote or not vote) is true I think you overestimate the ven diagram of people who are both homophobic and racist. There are plenty who are one and not the other.