Again, as you seem to be ignoring them....
1. It is yet another database where your personal details are kept on file and so yet another opportunity for the government to lose them. Given their current track record if they were a private company I wouldn't do business with them. And before you say "What use would a DNA profile be?", the profile itself will also be stored with your personal details, name, address, contact details, probably race and a myriad other details the police are allowed to hold.
2. We have a long history of "Innocent until proven guilty" in this country. Can you give me any reason to hold my DNA details that does not presume that I may commit a crime in the future?
You may well be quite happy to throw away this little bit of unimportant (to you at least) liberty for some extra security. It may seem perfectly acceptable to you. It isn't to me.
Not at all:-
(1) Give me my DNA profile, and I'll happily hand it out in the streets! I'll post it on the web... It's of so little importance. I suspect even you'd do it. Now, post JUST your bank account number and name... You wouldn't would you, would you!
People put too much importance on their magic DNA profile... It's nothing!
(2) Because EVERY criminal was innocent at sometime!
Why do you need to register your car, unless it's assumed you might drive away from an accident?
Again, we see some moralistic jargon being bantered around just because a meaningless list of DNA patterns are held somewhere.
Let's say your (& everyone's DNA sequence) on a database means countless criminals are caught quickly. And multiple crimes and murders are prevented... You're basically saying that little warm (unfounded) feeling in your tummy is more important... OK...
Going back to my gun ownership analogy. I'd love to own a gun. It would make ME feel safer in many ways. HOWEVER, I realise my selfish take on it is outweighed by the greater good to society. ie: Me NOT being allowed to own a gun, means every nutter out there can't either.
Though I'd rather NOT have my DNA in a database, I'll take one for the team for the benefit to society. And when I say 'take one for the team', the cost to me is.... nothing...