I am a libertarian because I do not believe that governments have political authority, as argued by Professor Michael Huemer in his book, The Problem of Political Authority: An Examination of the Right to Coerce and the Duty to Obey.
Here are two other answers I came up with:
I am a libertarian because majority opinions, elections, flags, anthems, rituals, traditions, badges, uniforms, charismatic orators and neoclassical architectural buildings have all failed to conceal from me the truth that threatening peaceful people with violence through governments is still wrong.
I am a libertarian because I apply the same moral standards to governments as you apply to all nongovernmental persons and organizations in society.
Many of the people who participated in the meme are anarchist libertarians, but most appear to be minimal government libertarians. This may therefore be a fun way to expose many people to new views.
A few peoples’ photos received over a thousand “likes” on Facebook. Professor Steve Horwitz‘s received 820 “likes” as of the writing of this blog post:
I’m a libertarian because I do care about the poor… and I don’t care how good your intentions are