I...don't know where you get the idea that libertarianism is about knocking everyone else down.
Perhaps if you focus entirely on removing welfare, it looks like that. And then, I (and other libertarians) believe that a Basic Income Guarantee would be extrenely useful, and a BIG would cover more people than current welfare systems.
Or perhaps you think that deregulating business will lead to massive monopolies, ignoring that the regulations you defend make it harder for new companies to enter a market (thus making it easier to hold a monopoly).
It's not like there haven't been regulations that cause more harm than good, though--for instance, regulations on pollution that only apply to new powerplants, leaving old ones untouched.
Libertarianism treats regulation like engineering: Simpler is better, and the ideal solution is the simplest; complicated solutions add more points of failure, which leads to a more broken result.
