Yes. But when it's being built by someone else in a not very transparent setting, what probability do you assign to its being generally-human-Friendly instead of particular-human-Friendly towards its creators? And how do you make sure its creators don't commit fatal mistakes?

Suppose a group (foreign government, startup, etc) is building a singleton. They say it's for the benefit of all mankind and other generally nice things. They won't let you inspect it up close and don't reveal their theories & tech, for fear of competition. Even if you offer to help, they say the value of your help is too small to risk your subverting their goals. You have the choice of:

1. Stopping them by force - use your biggest bombs, no questions asked.
2. Conquering them, trying to recover their technology, and using it to try to build your own singleton.
3. As above, but releasing all information and trying to make your singleton-building process 100% transparent and open to anyone who wants to participate.
4. Ignoring them.
5. Defending them against any attackers.

Edit: 6. Ignoring them but starting your own singleton project and trying to finish first. Variations: (6a) secret project, (6b) public but not transparent project, just like theirs, and (6c) transparent project inviting others to assist.

Anyone choosing 6 would have to present a very good reason for not choosing 2 or 3 instead, since competition is an obvious problem, winner takes all.

What do you do? I argue that most people/governments/armies will choose 1 or 2.