This is a genuinely contested political and economic question where reasonable people disagree based on differing values and interpretations of evidence. Rather than giving you "the answer," let me lay out the substantive considerations on each side so you can weigh them yourself.
Arguments for raising taxes on the wealthy
•Rising inequality: Wealth and income concentration at the top has grown substantially in many countries over the past several decades, which some argue justifies more redistribution.
•Revenue needs: Governments face long-term fiscal pressures (aging populations, healthcare costs, infrastructure, debt service), and taxing those with the greatest capacity to pay is one way to address shortfalls without cutting programs that benefit lower-income people.
•Effective vs. statutory rates: In the U.S. and some other countries, very high earners (especially those with investment income) sometimes pay lower effective tax rates than middle-income wage earners, due to preferential capital gains rates, deductions, and tax planning. Critics see this as unfair regardless of one's views on overall tax levels.
•Diminishing marginal utility: A dollar matters less to a billionaire than to a median-income family, an argument rooted in utilitarian economics for progressive taxation.
•Social stability/legitimacy: Some economists and political theorists argue extreme inequality undermines social cohesion and democratic institutions, and taxation is one corrective tool.
Arguments against raising taxes on the wealthy
•Already progressive: In many systems (including the U.S. federal income tax), the top earners already pay a disproportionate share of total income taxes relative to their share of income, which some see as evidence the system is sufficiently progressive.
•Investment and growth concerns: Higher taxes on capital gains, dividends, or high incomes could reduce incentives to invest, start businesses, or work additional hours — though the empirical magnitude of these effects is heavily debated among economists.
•Capital mobility: Wealthy individuals and capital can be mobile across jurisdictions, raising concerns about tax avoidance, offshoring, or emigration in response to higher rates — again, the real-world magnitude of this is disputed.
•Definitional complexity: "The wealthy" is not a monolith — a small business owner, a tech founder with mostly unrealized stock gains, and a hedge fund manager with carried interest all face very different tax situations, making blanket policy tricky.
•Spending vs. revenue debate: Some argue the core problem is government spending levels or inefficiency, not insufficient revenue from the wealthy.
Why this is hard to settle empirically
Economists disagree on key questions like how responsive high earners are to tax rates (the "elasticity of taxable income"), how much revenue could realistically be raised without behavioral offsets, and how to even define and tax "wealth" (unrealized gains, assets, etc.) as opposed to income. These are active areas of research without consensus.
My take: I don't think I should tell you what the "right" answer is — it depends heavily on value judgments about fairness, the proper size and role of government, and how much you weight efficiency concerns against equity concerns. If you want, I can dig into specific proposals (wealth taxes, higher marginal income tax brackets, capital gains reform, closing specific loopholes) or specific countries' data, which might help make the tradeoffs more concrete.