In a democracy, it absolutely is a criticism of a political party that it can’t win elections among an electorate that is securely rooted in the country, and must instead rely on newcomers who will put aside their own values because of their precarious circumstances. Democracy is about allowing people to create the society they want to live in, not maximizing individual freedom from moral regulation. Using immigration to enact social change that is undesired among both the people already here and people coming here undermines democracy.