Exactly how established is the track record of taking down fences without an understanding of why they were put up? A great many of liberalism's target fences over the years have been readily explained by being in the interests of the powerful (e.g. monarchy/aristocracy, slavery).
Founding the NHS, bringing in clear air and water acts, regulating minimum standards for child workers (and then all workers), extending the franchise. All these were done in defiance of precedent and with strong accusations of destroying prosperity.
The creation of the NHS is a good example. Nothing had been done like that before, and most of the predictions (both positive and negative) at the time, were very wrong (for instance, it was predicted that it would reduce medical costs overall!). This strongly implies that nobody really had any idea what was go...
Chesterton's meta-fence: "in our current system (democratic market economies with large governments) the common practice of taking down Chesterton fences is a process which seems well established and has a decent track record, and should not be unduly interfered with (unless you fully understand it)".