It is not a question about safety, it is about security. To illustrate the difference, in an airport, safety is about properly maintaining planes and security is about keeping terrorists out.

If we exclude all potential issues except those related to meltdown and spectre, Intel chips are perfectly safe, the results are correct and there is no crash. It means that if they were safe to use in critical systems like engine control units, they still are.

Meltdown and spectre are security bugs, they are usually treated differently from safety problems like with cars and drugs.