First of all, yes, decals can be ironed on the wrong side and shouldn’t be ironed on the right side and I should have mentioned that. If they MUST be ironed, use a press cloth (thin piece of material such as a handkerchief) between the iron and the decal. I cautioned because there STILL can be problems with some decals, especially on lower quality shirts or decals. If the temp of the iron is too hot, you can end up with the decal transferring off and end up with a mess somewhere, not to mention a ruined shirt. They were put on with a controlled heat process in the first place, so they can come off or ruined with it. Home irons are usually not as high quality as the more expensive professional ones and the thermostats are more likely to go bonkers with us (have you ever used an iron in a hotel, great example). That is why suggested avoiding it. Better to be safe than sorry, as the old saying goes.
As for Sparg’s comment, oh how I wish that were true and more money equalled better quality, and no sweat shops, but sadly, it’s not that simple and doesn’t necessarily hold true. Sweatshops can turn out high quality products because the people working in them have life or death depending on the quality of work they turn out. Really tough problem and even “Made in the USA” does not guarantee it wasn’t made in a sweat shop here.