I am, but you’d be surprised. All of the single-threaded languages are fine, for example. Very few languages are actually low-level enough to allow data races. C# and Java go to great lengths to avoid it.

Race conditions in general are another matter, and aren’t generally considered a requirement (though you can certainly create nasty bugs).

        Thread a = new Thread(() -> x++);
        Thread b = new Thread(() -> x++);

        a.start();
        b.start();