its not about the hids glare (which can be dangerous too) its about having bulb so blue that it is worthless as a headlight. you can argue this all you want but the blue and purple bulbs are not safe to drive with, they have poor lumen output, they are a funky color that strains the drivers eye and they can be distracting to other drivers. you argue that range rovers bmws blah blah blah, and not even arguing about glare only color alone those oem setups are all under 5000K. and provide optimal lighting conditions not 8000k not 12000k. hell I remember driving my moms maxima in heavy rain and with an oem hid setup I STILL had a hard time seeing. I can only imagine what trying to drive in the rain is like with super blue low output bulbs... its probably worse that the stock halogen setup
btw there are no d.o.t. approved drop in bulb retro kit.. anything that has been converterd from halogen to hid with a drop in bulb is pretty much illegal.