Hog wash! It is the treated packaged printable fabrics, like Printed Treasures, that are the flamable problem in laser printers, not the actual act of printing labels or anything else on fabric. Fabric does not catch fire, the chemicals in the pretreated stuff is what catches fire.
It is quick and easy to print with laser printers using freezer paper and prewashed fabric.
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It is not, however, as long-lasting if frequently washed as the inkjet images. One way to keep laser prints from fading is to spray them with Krylon fixative, but they are not really washable and definitely not dryable if you do that. Krylon is a plastic coating and heat will degrade the image. Art quilters use laser printers all the time for fabric images, but most of their works are not washed.