Are the statues celebrating slave traders? I highly doubt any of these statues were erected in remembrance to outstanding achievements and commitment to trading slaves. Like I said before most historical statues are erected to remember people who did good for a certain area, and a lot of those people did this good while doing bad elsewhere.
Even histories greatest monsters (Hitler, Pot, Stalin, Gerrard etc) did some good at some point.
Statues being taken down is not the end of the world and people saying "what about" to statues/monuments that will obviously not be taken down are mad.
Nelsons column wont come down for example as it is a historic monument and a landmark. Hardians Wall wont come down because 1, its a wall, and 2, its a world heritage site.
Taking some statue down that my look half decent but holds no real cultural significance is not the end of the world. The only person who should be upset is the person who sculpted it.