OK, I am really regretting getting involved in this, I wasn't even making this argument! Im no Ayn Rand loving libertarian, although I have read her work, but you can't post a definition that completely contradicts your argument and then ignore it! None of those definitions remotely applies to charitable donations! You suffer no penalty if you do not donate to charity. Try not paying your taxes and see how that works out for you.
Begging might upset you, but it contains no element of compulsion until it becomes a mugging.