"...superiors who call him a model officer". Do CPD's problems start at the top, then? Is thuggery expected and encouraged?
Is this cartoon an ad hominem attack, that the artist thinks libertarians are lazy and don't feel the need to return value to their employer for the the money they're paid? If we're going to go ad hominem (which is fun, but hardly an intellectual argument), engage in group-think, and assume that one's political beliefs inform one's work ethic, I'd propose that Democrats with their sense of entitlement are probably less motivated to do their jobs than libertarians. The lifeguard is probably actually a Democrat: “Why should I help you, that's what the government is for.” Silly, I know.
To meet ad hominem with ad hominem: perhaps this cartoon an admission of ignorance and a cry for help, for enlightenment? If so, I'm happy to oblige:
In a libertarian society, this lifeguard would be in a pantsload of trouble, perhaps even more so than in a legalist/statist society. In a libertarian society, he would be liable for compensation to the families or other representatives of the victims, as well as criminal charges, termination of employment and a loss of reputation. Negligent homicide is strictly forbidden by libertarianism.
Libertarianism is not and has never been “you're on your own”. There's nothing in libertarianism that prevents people from banding together for mutual satisfaction of needs. Just the opposite, libertarianism encourages peaceful social cooperation. Without the ability to direct the guns of government to do your bidding, problems have to be solved and needs met by voluntary cooperation.
It's my belief that libertarians have more respect for your life than authoritarians do. Who has more respect for you and your life: someone who demands that armed men force you to do what they want, or someone who tries to get what they want through persuasion and negotiation?
Libertarianism for the win.