I love the biodiversity I manage to get in my city garden, and never felt any danger whatsoever. My kids and I do a game where we get points for pointing out insects we haven't seen before.

One year we had a hornet nest in a tree, but we left them alone and they us.

There are wolves in the region now, but not in cities and they avoid humans.

I never felt any danger whatsoever from wildlife.

Of course it may be somewhat different where you are.