Ugh, who has given the few moral or - more importantly - legal authority to determine what is divisive and what's not? The very idea that you can "reinforce [extinguished] conflicts of the past" by building memorials to either side of a conflict is absurd.
What matters is the angle from which you present the past. For example, if you're building a memorial to what happened in Nazi death camps, you need to make it clear how horrible those were, and what absurd dogma they served. You need to present history's ugly side and convey why this particular lesson needs to be remembered, regardless of how unpleasant it may be, or how "divisive" those few insist it allegedly is. Future generations should learn the history and ask the tough questions, even if those may yield divisive answers. This is why our species needs its inherent intelligence - to differentiate and make logical conclusions, to learn - not simply judge and persecute those who disagree.
Eventually, it comes down to how you choose to see it. You can be wise and preserve history, or you can be dumb and try to force pink glasses on as many people as possible, hoping that future generations will have easier time understanding the past. But by taking the latter approach you risk to enable future generations to repeat mistakes of the past.
Even when it comes to small cases, such as this, should you choose to enter the argument - you will find yourself supporting either side. The only 3rd way there is to abstain from arguing and see which side prevails.