Shinzō Abe was an (indirectly) elected politician, though. The consequences for his actions should be people not voting for his party again. Murdering him because you disagree with people who voted for his party is not just an attack on one person, it's an attack on democracy.

What the recourse should be for those at the top of corporations whose decisions negatively impact millions of people is far less clear. "Voting with your wallet" isn't really a thing if you only have bad choices.