There's selection bias going on because only dumb criminals get caught, so you only hear about the dumb opsec practices of those criminals. Conversely, you'll never hear about the opsec practices of that professional crew with perfect opsec that hacked an exchange/difi contract and disappeared into thin air.
I haven't studied criminology, but I alternatively suppose someone who does that just doesn't think that far ahead. This likely also explains why the vast majority of people with these capabilities choose to live a life in accordance to their country's laws.
Or, the TLA involved have some sort of crack or acceleration procedure; the TLA say "the criminals were dumb" because the people involved can't combat that without admitting guilt, and who'd believe them. The real reason is the TLA used illegal access and tools that we wouldn't be happy they're using against the civilian population? Oh, and the people using the tools are guilty by association so they're inhibited from whistleblowing.