...Who would want to go round picking up dog shit, cleaning vomit of the pavement and picking up needles and condoms from a park, day and day after day?
Socialism isn't the answer, but your example highlights the problems with capitalism. Presumably your point was that people need to be recompensed for doing shitty work. But capitalism doesn't recompense people based on how shitty their work is. Nor does it recompense them based on how smart/able/hard working they are. It recompenses them based on a combination of ability, luck (being born into the right family), and most importantly, greed. So people with a conscience will accept lower pay to do work that they think is important and worthwhile, whilst the greedy will go after maximum dollars. That's half the reason why fund managers and executives etc get paid enormous salaries and bonuses while nurses, school teachers and the like get paid not a fraction of executive salaries.
The other half of the reason is that people who work in basic essential services, such as nurses and teachers, have their pay heavily regulated, which needs to be done in order to keep the costs of the services down. Most people would agree that a successful society needs affordable health care and schools. The problem is that the fat cats get all the benefits of these cost- and salary-regulated services, but don't contribute in the same way themselves. In essence, they are parasites.
You can talk all you like about the benefits of capitalism, but as long as you want to maintain affordable basic services, then you have a two-tier system and you no longer have a level playing field. I can see three solutions to this:
i) de-regulate and privatise everything. Let nurses, teachers, schools and hospitals charge whatever the hell they like. We'd soon see a lot of teachers and nurses earning a lot more money. We'd also see unprecedented poverty, hardship, crime and a rapid deterioration of society as it became ever more split in two.
ii) put a cap on the maximum earnings (or an effective cap with taxation, or see iii below) of any individual as a percentage of the median salary for workers in regulated/government industry. Yeah - I know. That would cause lots of execs to relocate to other countries. Good riddance. Recent events have shown that they're not particularly great at their jobs, and there are enough people in the UK/Europe with a conscience who will happily do just as good a job for less compensation in a fairer society.
ii) allow public services/hospitals/schools to charge whatever they like to those working in private/unregulated industries where their salary is higher than the median-based cap in ii). Hey - you reap the benefits of an unregulated market? Then you're gonna have to pay the price. Your council tax bill, medical bills, car licence, kids' tuition fees are going to skyrocket, but why shouldn't they - you're currently a parasite on all the council workers, nurses, teachers, etc. who are keeping your life affordable by working for 1/100th of your salary or less.