No, I'm pretty sure you don't. If you did, you would certainly be able to identify the difference between Macho and a Personal Belief.
I'm happy for you and the fact that you seem to believe in something that works for you but you are sadly mistaken if you think that what you believe is the way for all. There are plenty of very justifiable reasons why those who thing this man should be dead or serving the rest of his life in a cell with other violent inmates is not entirely wrong.
If the question is, who are we to believe we have the right to make such decision, the answer is that we are Society and that is where you live. I don't agree with all things Society believes or even decides but I am not so foolish as to believe that my own personal opinions can change societies beliefs or even to decide that Societies beliefs are 100% wrong and mine or 100% right. You live within the confines and protection of Society. If you accept this, then you must accept that Society will also decide on certain aspects of your life. People who accept this are not wrong.
If you want to "fix" a person's Brain, that's fine. Show me how that's done in a reasonable way and I can support that. However, don't tell me that we need to "Fix" somebody who has a problem, such as this and then have no means by which to do so. That only puts more people at risk and while I understand that Death is not the accepted means by which solving this problem is currently handled, I also understand that this is not what a very large segment of our Society believe. I hear a lot of people saying it's not human but I don't see a lot of those same people providing any long term solutions on how to "fix" these people. One actually has to question if life long incarceration is more human then simply putting these folks to death. A very real question IMO.
Your idea of what is right is not a consensus. I ask you, how is it right, to force your opinion on every person or to consider others opinions and decide to live within the confines of what Society decides is moral? You must also consider that it may not be just your own Daughter who is being considered here. There are lots of parents out there with Daughter, and Sons for that matter, who must be considered. As for other corporeal planes of existence, be it 31 the Buddhists believe in or the 7 Michael teachings the New Age folks aspire to or anything in between, those are not what Society, as a whole. aspires to.
I am all for personal beliefs but I am not for assigning any one personal beliefs on all of Society. If I must be concerned with what my Daughter might be in another life, then I will deal with that reality when it actually exists. Who knows, if that actually comes to pass, the person who might be my Daughter now may not be my Daughter then. She may be somebody else's and I may be a rock, which in that case, will not be a concern to me.
In short, I don't agree.