No, it's about transparency in our democracy and public record. If the website encouraged people to harass Mormons who donate, that would be wrong. If anyone does harass Mormons who donate, that is wrong. But disseminating public information is fine.
You know what WON'T happen to any of the people who contributed thousands of dollars to Prop 8? They won't have their marriage licenses taken away. But that will happen to 18,000 married couples in California, many of whom have children. That's not defending families, it's attacking families, and it is bigotry plain and simple.
The website demonstrates that the LDS Church's encouragement to Mormons to support Prop 8 was extremely successful. Mormons donated $14.8 million in contributions of over $1,000 each. That's nearly half of all such contributions.
Read FAQ, etc. Public information - fine. Intent? To harass. Clear to those within the target group. Might not be clear to you.