I don't know why but I have the feeling you would consider things differently if you happened to be one of these 2. Actually, even if there were only 2 - which isn't the case - that would already be too much.
But anyway, these 2 are just examples because we made a movie about them, their case is unfortunately not unique. The governer Ryan of the state of Illinois decided to stop with death penalty in 2003 for the sole reason that too many people in the death row were found innocent. Indeed, for Illinois only, a total of 18 people were found out innocent since 1976 on the death row.
Here are nationwide statistics of people found out innocent in the death row since 1976 in the US:
Alabama: 5
Arizona: 6
California: 3
Florida: 21
Georgia: 5
Idaho: 1
Illinois: 18
Indiana: 2
Kentucky: 1
Louisiana: 8
Maryland: 1
Massachussetts: 3
Mississippi: 1
Missouri: 3
Nebraska: 1
Nevada: 1
New Mexico: 4
North Carolina: 5
Ohio: 2
Oklahoma: 7
Pennsylvania: 6
South Carolina: 2
Texas: 8
Virginia: 1
Washington: 1
A total of 116 detainees were found out innocent in the death row since 1976 in the United States. How many of them have been killed before being found innocent? We will never know, but saying there hasn't been any would prove a great trust in a judicial system which has sent at least 116 innocents in the death row since 1976.