The statement accurately captures the foundational premise and primary objective of Public Interest Litigation (PIL). PIL emerged as a revolutionary concept in judicial activism, particularly in India, to democratize access to justice and ensure that the fundamental rights enshrined in the Constitution are not merely theoretical but practically enforceable for all, especially the marginalized and vulnerable sections of society. However, like any powerful tool, PIL has its strengths and weaknesses, necessitating a critical analysis.

The Core Premise and Its Strengths: Historically, the Indian legal system, like many others, operated on the principle of 'locus standi,' meaning only an aggrieved party could approach the court. This often left vast segments of the population – the poor, illiterate, socially backward, or those in custody – without recourse, as they lacked the resources, awareness, or ability to initiate legal proceedings. PIL, pioneered by the Indian Supreme Court in the late 1970s and early 1980s, broke this barrier by relaxing the locus standi rule. It allowed any public-spirited individual or organization to approach the court on behalf of those whose rights were violated but who could not approach the court themselves. This led to several positive outcomes:

1. Access to Justice: It opened the doors of justice for the voiceless, ensuring that fundamental rights like the right to life, dignity, clean environment, education, and health are protected for all.
2. Judicial Activism for Social Change: PIL became a potent instrument for judicial intervention in matters of public importance, leading to significant reforms in areas like environmental protection, prison reforms, child labor, bonded labor, and women's rights.
3. Enforcement of Collective Rights: It allowed for the enforcement of rights that affect a large group of people, rather than just individual grievances.
4. Accountability of the Executive: PIL has often compelled the executive to perform its duties and uphold the rule of law, acting as a check on governmental inaction or abuse of power.
5. Innovative Remedies: Courts have devised creative remedies, including appointing commissions to investigate facts, issuing continuing mandamus, and monitoring the implementation of their orders.

Critical Analysis and Challenges: Despite its noble objectives and significant achievements, PIL has faced criticism and challenges:

1. Misuse and Frivolous Petitions: The relaxation of locus standi has sometimes led to the filing of frivolous petitions, motivated by personal vendetta, political mileage, or publicity, rather than genuine public interest. This 'Publicity Interest Litigation' or 'Private Interest Litigation' burdens the courts and diverts their attention from genuine cases.
2. Judicial Overreach: Critics argue that PIL has occasionally led to judicial overreach, where courts delve into policy-making or administrative functions that traditionally belong to the executive or legislature. This blurs the lines of separation of powers and can lead to a 'judicialization of politics.'
3. Lack of Fact-Finding Mechanism: Courts are primarily adjudicatory bodies and may not have the necessary investigative machinery or expertise to gather facts in complex socio-economic issues, leading to decisions based on incomplete or inaccurate information.
4. Implementation Challenges: While courts can issue directives, the actual implementation often rests with the executive, and ensuring compliance can be a protracted and difficult process.
5. Selective Justice: There's a concern that PIL might focus on certain 'glamorous' issues while neglecting other equally pressing but less visible problems.

Conclusion: In conclusion, the statement accurately describes PIL's intended role as a vital tool for protecting fundamental rights, especially for the disadvantaged. It has undeniably played a transformative role in Indian jurisprudence, expanding the horizons of justice. However, its effectiveness hinges on responsible use by petitioners and judicious application by courts, ensuring it remains a shield for the vulnerable rather than a sword for personal agendas or an instrument for judicial encroachment into other branches of government. Striking this delicate balance is crucial for PIL to continue serving its noble purpose.