You tell us. Isn't that what scientists are supposed to be doing?
Are you implying that they are self-assembling even now?
What is the mechanism? What are the proofs to support that?
And, are viruses alive?
If they aren't that's no proof that life is self-assembling.
If they are, where did they come from?
Also, define life and then tell us if the appearance of these viruses is part of origins or evolution and when it made the transition.
So, to the extent we are alive, so are they.
In fact, ever since the discovery of DNA it's been a bit inappropriate to refer to viruses as non-living.
Craig Venter, the fellow who did the human genome project (to completion) is out there sailing around the ocean scooping up viruses out of the ocean, and so forth. He's a top name in this field.
Exogenous transfer of genetic material among/between species is a fact you have to live with. We are constantly becoming a new critter with or without "evolution", Besides, Darwin and that crowd had no idea what mechanism might drive evolution so they came up wit "natural selection" and other demi-gods as explanations. Obviously there are no demigods, and if a virus manages to penetrate your genome and find a home, well, now, your ancestors are that virus and all the people before you.
Since DNA acts in a quantum fashion, it doesn't gradually work its way into your genome ~ it goes to work right now!
Think of some viral infections as being essentially the same as sex, only different!