chavscum.com should explain it all, if its still there.
On topic: I'm somewhat hamstrung in the "fear causing" department, as just by my basic appearance, the general public are that much more wary of me. I'm probably about average build, and about 6ft tall, which isnt particularyl intimidating. What seems to cause the issue are several of my aspie coping strategies, and one or two of the original symptoms. First, my eyes. Nature has seen fit to reward me with a particularly piercing shade of blue, which, when coupled with the constant frown, tends to make me angry or agressive almost constantly. Few people realise that my facial expression for "wtf is going on" is the same as "im going to stick my hand down your throat and tear out your lungs", much to my chagrin. To cover that, I wear shades almost all the time, which apparently causes a sort of creepy matrix secret agent kinda look, which isnt much of an improvement. Second is defensive dressing. I wear clothing that sits outside the norm somewhat, in order to give people a reason to be giving me strange looks and suchlike. This nicely covers the fact that Im convinced im getting such looks even when wearing EXACTLY the same clothes. Unfortunately my choice tends towards black, semi military, and biker. Combat boots, combat trousers and a biker jacket are all incredibly useful for various reasons, but it does rather make the average passerby think you're about to skin them alive. However, as far as Im concerned, this is all to the good. I like the fact that people avoid me and are scared of me. It makes them much more likely to leave me the hell alone and not engage me in meaningless discussion or otherwise socialise with me.
As for people who actually know me, well.. most of the time Im relatively calm. I spent many long undiagnosed years dealing with NT life for better or worse, and have developed hundreds of strategies for dealing with all the NT crap that happens. However, when riled, i do tend to have a vile and explosively unpredictable temper, and those who know me are wary of driving things too far in the wrong direction. Im quite happy with that, cause I dont particularly enjoy the stress and shite that goes with a blowout. As an added bonus, the people who have truly truly pissed me off tend to do almost anything they can to avoid me, which makes for a very peaceful life all said. (One guy who slept with my gf behind my back ended up changing countries to avoid me, which suited me perfectly lol) Far as I can judge it, if people fear you, they leave you the hell alone, and in my particular aspie world, thats awesome.