Yes fajitas can be bad for you if you eat too many of them or eat the fajitas that are not homemade.
The best fajitas that are the best for your health are the homemade fajitas where you know what all ingredients you put into them.
If you make fajitas at home you can avoid too many fattening and non healthy ingredients but with fajitas that you get at the store or a restaurant they can contain other unhealthy ingredients that can make them not good for your health.
But even the fajitas that are served at restaurants can be healthy in moderation.
They do contain protein and some other nutrients but there's not too many health benefits of fajitas but they are okay to eat in moderation.
Just don't eat too many fajitas and you'll be okay.
Too many fajitas can also cause weight gain.