People keep asking that on the G Adventures forum. It's always women travelling alone who are worried about whether that's safe.
Of course it's not safe. Nowhere's safe, and some places in Europe are particularly unsafe. If you're living in the USA, though, it looks like it might be a lot safer than staying at home.
If you think that's bad,
check out the scattergraph for the whole world. South Africa? Nauru? Cote d'Ivoire? Angola? Sudan? Even Swaziland and Zimbabwe are looking at you and wondering how you're getting it that wrong! There may be a hint
here but seriously, how ARE you getting it that wrong?