Nazi memorabilia: is it wrong to collect it?

I find collecting Nazi memorabilia for the sake of collecting very distasteful, but if people hadn't collected it then a lot of it might have been lost to history. People tend to understand history significantly through genuine artefacts, so I'm thankful some people did preserve Nazi items, so it's helpful to teach the next generation exactly what the artefacts represent and how abhorrent Nazi ideology is. I think it's more powerful for a youngster to look at a Nazi uniform in a museum, whilst learning about the people who wore it and what they stood for.