I am currently bootstrapping a business and I have been approached by VCs who asked me to please take their money. I have turned them down because, as I politely told them, I don't need it, AND I am not looking to simply flip the company some day (no sane investor will invest unless the company can be sold in some form and they get their money back). Some people may also wish to avoid having a boss, and if you think your VC is not your boss in some capacity at least, you're in for a rude awakening.
Calling someone's decision to avoid raising money irrational and attaching labels (morality?) is presumptuous. There are certain goals that are incompatible with accepting funding, such as: operating a lifestyle business, not reporting to anyone, freedom etc. I am not sure what's so difficult to understand about that.