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It is a general truism that it is better to fix the problem before it has become critical; addressing a potential problem before it has become a problem is always superior to addressing a potential problem after it has fully manifested.
There may be an exception to that general truism; if there is, I cannot think of one right now.
RC
When remediation is less expensive (time, money, and resources) than mitigation costs mulitpled by probability, the truism fails.
There are certainly cases where fixing the mess is cheaper than preventing it.