You're conflating payload delivery with booster recovery. The booster went 23/23 on payload delivery, which is clearly safe enough for human flight. If you wan

You're conflating payload delivery with booster recovery. The booster went 23/23 on payload delivery, which is clearly safe enough for human flight. If you want to compare it with the space shuttle, you should compare apples to apples. In terms of booster recovery--where the Falcon 9 failed--the comparison would be 0/67 for the shuttle vs. 22/23 for the Falcon 9. Seems a tad odd to say that 0/67 is acceptable, yet 22/23 is suspect.