If Carson wants to sip tea on his back porch then you can talk about crime and leaving the door open.
If Carson wants to run for president, he is responsible to run a strong campaign and not stumble into situations like this. It was a stupid move on Carson’s part and one that would be much less likely to be made if he had run a successful campaign under his belt... but he wants to run for president as a rookie.
Rookie mistake, rookie results.
You can say the exact same thing about Cruz and Rubio.
If Cruz and Rubio want to run for president, they are responsible to run a strong campaign and not stumble into situations like this.
This exists, because they made it exist. They did it.
Whatever happens or does not happen as a result of their choice of action is on them.