This issue can go Hang.

Whether we breed cattle or grow crops, there will alway be errors in reproductive coding which produce faulty products.
The same thing happens with humans.
They can be born with bodies that are oddly shaped or disfigured.
Or they can be born with brains that are 'wired' differenly, which have a different emphasis on emotion.
So we need to stop thinking of people as evil or depraved, and realise they are just different.
Stop 'hating' them, and instead treat them as defective items.
Take away the cruel intent shown by some towards them.
For that is showing your instinctive behaviour at its worst.

When their difference makes them harmful to society, they must be removed from normal social life.
But putting them to death is a bit drastic.
Who is going to do it?
Before you write blithely about how necessary it is to kill off harmful persons, stop and think.
Would you be willing to execute another human being by one of the means we have available?
Would you personally supervise such an event?
If not, how can you expect others would do so?

I think we value human life, even the 'errored' kind.
So we must just keep those persons separated from the rest of society.
There is a cost for this, but that is something we must allow for.
We know in advance that not every child will be born without blemish.
And one of those children might be your own.

Somebody wrote:
'I believe in life after death and I know for a certainty that I shall never be disappointed in that belief.'

I am curious.
It is a certainty?
What makes you so sure there is life after death?
Is there strong proof of this that for some unaccountable reason I have missed out on seeing?
What is that proof?

But I do agree with the phrase 'I shall never be disappointed in that belief'.
When you die, it is because your brain has ceased to function.
When it stops, all feeling stops too.
So no happiness, and no disappointment either.
'No nothing' as they say in the classics.

Ipso Facto,

You win the packet of popcorn.

As I said ‘ . . .I shall not be disappointed”

Premise: (a) I believe in life after death and (b) I shall not be disappointed: ’
Argument: If (a) proves to be true then (b) follows, if, however, (a) proves to be untrue then (b) does not follow.
Conclusion and proof: If there is life after death I shall not be disappointed, and if there is not I shall not exist and therefor could not be disappointed.

Would you be willing to execute another human being by one of the means we have available?
Ipso fatso,
Ask a partner or relative of a victim !

Foxy & Paul1405,
What would you do with someone who murdered or hideously/psychologically maimed one of your loved ones out of sheer malice ?