If a cartoon puts Google employees in a position where they could be targeted by threats or violence, it would be an awful move.
You are saying "Let's give in to violence and intimidation". You are suggesting that free speech should not be exercised if there is any threat or violence. That is not free speech.
It's not "giving in" when you would never do something like that in the first place (without the threat of violence). It's just continuing to not do it.