I don't even know where you're going with 'personal liberty.' The economic system has so little to do with what you're allowed to say, which god you're allowed to worship, or how you spend your free time as to be completely orthogonal.
We have three essential freedoms: life, liberty, and property. Taxes reduce our property, so their use must be as guarded as are the limits on the other two. You almost hit on it with your last example; indeed, if I choose to spend my free time in an activity that I can no longer afford due to high taxation, that's a clear negative impact due to the economic system.
If you look at this list, the majority of these problems are man-made. Other than a super volcano and an asteroid impact, the solution seems pretty simple. We must abandon all technology and kill all but a small percentage of the population. And those that are left must live in isolated groups. That way there will not be a world wide disease outbreak.
Yep, that's the only option. There's nothing between doing nothing and that option. It's all we have. And if anyone starts to talk about mitigation strategies, planning ahead of time or devoting a single cent of taxpayer money toward preparing for it, we are just all going to have a meltdown and throw a tantrum with teabags on our hats. Thank god we have these strawman arguments for what these ivory tower Oxford elitists are telling us to do: eliminate the human race to protect the human race. I cannot believe they would actually come to that conclusion but there it is, right in the article. Those environmentalists will have us starving in mud huts by the end of the month if we just sit by and let this academic report go unabated and without criticism!
*tortured sigh*
"Spock, did you see the looks on their faces?" "Yes, Captain, a sort of vacant contentment."