The negative connotations of the word aside, it seems perfectly reasonable to call C dangerous. Without that "danger", you couldn't write an OS kernel, a language runtime, or various other low-level code we need on our systems; on the other hand, when writing higher-level code that doesn't need that level of raw access, it seems useful to remove the possibility of a broad class of mistakes.

See also Rusty Russell's rules about "easy to use versus hard to misuse". I find C easy enough to use, but also easy to misuse.