You’re presenting the data for whether it’s okay to be happy about a political figure’s death, not whether it’s okay to cause one. There’s a section about this you should read starting with “YouGov's polling doesn't suggest that young people or liberals are more pro-violence in general”, and in particular the stark divide about self-defense. None of this is great, but it’s hardly surprising that a minority of younger people are more supportive of violence than people who have more life experience and fully-developed frontal cortexes.