The problem is the reclaim case is more damaging whether it happens more or less often.
If someone rezzes the wreck he shouldn't then what? One wreck is blocked, but there is always plenty of other wrecks to reclaim. And if there is really just one single wreck to be reclaimed, it is also very likely it is worth to rez it.
Now if someone reclaims the wreck someone else is rezzing then this is what happens: he directly drains his teammate metal income, because rezzers try to refill the wreck that is reclaimed. It is exactly the same as if one reclaimed a nanoframe the other is building.
Now if the wreck is completely reclaimed the teammate also loses all his energy and time investment he put into the rezzing process. So many times I had something 90% rezzed then a "friendly" con comes and starts reclaim because why not.
Rezzing is hugely beneficial over reclaim, it gives the full unit instead of just 40% of its value in metal. If someone already made the investment in rezzing units, and the wreck is not about to get into enemy hands, then in almost all cases it is for the benefit of the TEAM to let the rezz continue undisturbed.