Does Casey Anthony case really "show Florida's death-penalty system is broken"?

The question in the title of this post is prompted by this notable recent commentary in the Orlando Sentinel, which is healined "Casey Anthony case, others show Florida's death-penalty system is broken." Here are excerpts:

Support of the death penalty is almost a prerequisite to holding statewide office in Florida. Kill more. Kill them faster. But this political agenda is clashing ever more often with the constitutional requirement of due process.

And so we are spending millions of dollars sentencing far more people to death than we can possibly kill. The result has been a growing glut of death-row inmates. Consider these statistics:

• Since the 1970s, Virginia has executed 121 inmates. It currently has 14 death-row inmates.
• Oklahoma has had 96 executions. It currently has 85 death-row inmates.
• Florida has had 69 executions. We have 399 inmates on death row.

At our current pace of executions, it would take 200 years to clear them out. More people on Florida's death row have been exonerated, resentenced to a prison term or died while awaiting execution than have been executed.

The 23 inmates exonerated and set free are the most of any state, making our system the most error-prone in the country. Some of these inmates were obviously innocent. Some probably were guilty, but trial errors, prosecutorial misconduct or other issues nullified their convictions.  Ironically, if these freed inmates had been sentenced to life in prison without parole instead of death, they probably would still be in jail because they wouldn't have had access to the scrutiny and appeals granted death-row inmates....

There also is no rhyme or reason to which cases are pursued as capital crimes.  The original purpose of the death penalty was to execute the worst of the worst.  But legislators have consistently expanded the types of crimes eligible for the death sentence, so now it can be pursued with most all murder charges.  This gives state attorneys wide leeway in deciding what cases to pursue as death-penalty cases.  Most state attorneys don't have written guidelines, making their decisions completely arbitrary.

Sometimes they are driven by politics, as with Casey Anthony.  This is not a death-penalty case, and in the unlikely event she is sentenced to death, it will be overturned on appeal.

So why pursue it?  A death case requires jurors who state beforehand they are willing to impose a death sentence.  Such jurors are more prone to deliver guilty verdicts.  If you have a shaky, circumstantial case in a high-profile trial like this, you increase the odds of a conviction by stacking the deck with a death jury....

All this comes with a cost.  Death cases are very expensive because they require two trials, one establishing guilt and the second to impose the sentence.  Then come years of appeals. One death-row inmate had his case reviewed 20 times by state and federal courts before his sentence was reduced to life in prison.  Judge Eaton cites estimates that each execution costs Florida about $20 million....

And yet this year Gov. Rick Scott and legislators abolished the Commission on Capital Cases, a small state agency that tracks cases, keeps statistics and makes recommendations to the courts and lawmakers.