All this statue defacing and removal..
what statues should we have..
of whom?
You can probably find a few people, in this country, who'd oppose just about any statue you put up. That's diversity of thought for you. But, a good thing to ask, when deciding whether a statue is appropriate or not, is "
What, exactly, is this statue meant to accomplish?"
In the case of the confederate statues, that's clear. Many of those were erected in the period between 1890 and 1930, when white supremacy was under attack and there was a huge backlash against that progress -- with KKK membership peaking in the 1920s. What those statues were meant to do was to stand as a symbol of white supremacy, by honoring people's willingness to kill their fellow Americans in support of slavery. They were meant to be a symbol of white power. As any decent person will tell you, that's an atrocious use of a public space. And so decent people don't want those statues left standing in those spaces.
There are statues where things aren't that clear-cut. For example, there are statues of deeply divisive figures like Wernher Von Braun -- a man who was an SS officer and father of rocket-attack terrorism in WWII, but who was also a genius who worked tirelessly for the American space program and ended up playing a pivotal role in one of mankind's greatest scientific accomplishments. Asking "what, exactly, is this statue meant to accomplish" leads us to a non-offensive answer, in that case. It's meant to honor and memorialize the work of a leading figure in space exploration. If, instead, the same man were memorialized with a statue of him as a young man in a Nazi uniform, the answer to that question would be different. And so we'd come to a different conclusion about whether it's appropriate. So, as you can see, it's not just a question of who we should honor, but also how.
Context also matters. Even for someone being honored for an appropriate reason, the context might be bad. For example, picture a statue of Von Braun in a neighborhood in London where people still lived whose parents and grandparents had been killed by the man's efforts? Even if the statue were focused on his space-exploration efforts, not his Nazi era, I would fully understand if the community didn't want that statue there. Similarly, if representatives of a Jewish community objected to having it in a predominantly Jewish neighborhood, I would advocate moving it somewhere less tendentious. But a statue to him in, say, Cape Canaveral or Houston, focused on his work for NASA, would be just fine.