The reason given for the taboo was that reassosiation prevents the symbiote form moving on, a really weak reason imho that also implies that the host is the one at fault when in reality the desire to reassociate lies purely with the symbiote.
Where did you pluck that reason from?
I got it from what Bashir says in the episode when he is explaining the taboo to Kira.
'The whole point of joining is to allow the symbiont to accumulate experiences over the span of many life times. But in order to move on from host to host, the symbiont has to let go of the past...let go of parents, children, siblings, even spouses.'
Of course now that i go back and look at that snippet of dialogue i see recall that it doesnt imply that the host is at fault i got confuddled on that point sorry.