Valitania’s long-standing practice of paying high salaries to its elected politicians has had a disastrous effect on the level of integrity among politicians in that country.
Conclusion
Valitania's practice of paying high salaries to elected politicians has led to a decrease in the integrity level among politicians.
Evidence (this is because)
The prospect of earning a high salary is attractive to those whose primary aim is to make money.
Inevitably, the wrong people (those more interested in making money than in serving the nation) have been attracted to Valitanian politics.
Evaluate
This argument fits the pattern of criticizing a Plan / Goal.
GOAL: elect good people to office PLAN: entice them with high salaries
The author is arguing that the plan is failing to achieve the goal, because the high salaries will attract people who just care about money.
How can we argue the plan is working?
Maybe we could say that the plan also attracts high integrity people, and those people usually beat out the money-hungry ones in elections. In other words, high salaries attract everyone, and the voters elect the best options.
Or we could argue that people who just care about money still wouldn't be that into running for office (maybe other jobs pay more or require less effort to make the same amount of money).
Or we could argue that the money-hungry people end up getting good at serving the nation, because that's the best way for them to get re-elected and keep their lucrative job.
Goal
Let's find an answer that allows us to defend these high salaries against the charge that we will end up electing shallow, money-hungry people who aren't good at serving the nation.