The “justification” is the law. See art. 10 al. 2 LIFD, art. 20 al.1 let. e LIFD a contrario, art. 7 al.3 LHID a contrario, art. 13 al. 3 LHID
Can’t answer this question. Especially because it depends on your potential tax savings as well.
Yes, the value of the share for the wealth tax can go near 0.
Finally, I don’t give the name of the funds I own, the same way I don’t give the name of the companies I own