Can you be Christian and Favor Death Penalty?

[Gabu]

But the Bible also says,

"Judge not, that ye be not judged." - Matthew 7:1

Isn't taking someone's life away the ultimate of judgments?

[Gabu]

Okay, what does it mean, then?

[Gabu]

Well, after that part reads the following:

"For as you judge others, so will yourselves be judged, and whatever measure you deal out to others will be dealt back to you.  Why do you look at the speck of sawdust in your brother's eye, with never a thought for the great plank in your own? ... You hypocrite!  First take the plank out of your own eye, and then you will see clearly to take the speck out of your brother's." - Matthew 7:2-5

I don't see how this is saying, "Don't proclaim to be better than others."  How would you be "deal[ing]" a "measure" by proclaiming to be better than someone else?

[Gabu]

Okay, if you want to look at it that way, then how is taking someone else's life not telling that person that those making the decision to do so are better?