Hagrid risked being chased by death eaters (who were known for insane brutality) with low magic skills (because he got expelled in his 3rd year and wasn't allowed to practice magic since then).

It was shortly after the incident, so neither was Voldemorts defeat fully confirmed, nor did he know, how the death eaters would react to their leader being almost killed. He still took the risk

It was a genuine question, and I find your approach very interesting. It would be also cool to analyze how the stereotypes about vampires have changed in their portrayals in different historical contexts.