Pure anecdata; the libertarian/capitalist anarchists I've met have all been close to sociopathic in their disregard for others. I always figured that people who have an underdeveloped sense of empathy project this onto everyone else.
So, how is trusting politicians and bureaucrats to be selfless and focused on their duty to society working out for you?
And it’s not an ad hominem on its own when the argument he is making is that the people espousing a certain world view are doing so because they believe everyone else has their same myopic view on reality and empathy.
And it is an ad hominem - it's nothing more than an allegation impugning the character of libertarians in order to dismiss their arguments. The allegation alone does neither prove anything about the actual character of these people, nor what their view on reality and empathy actually is, nor if that view is actually wrong, nor who is doing the actual projecting here.