Do you think there are two kinds of every sign, a nice type and a dark type?

Not sure, I only met bad and good of Cardinal signs, and bad and good Leo.

Leo especially is the type that either is really good or is really really the worst person on Earth. so far I have never met a really bad mutable or fixed.

I never met people that were really bad or really good from other signs (hope I won't!!)

I am telling you about my experience in real life. Also I am not sure what you mean by dark and good, critical is not bad to me, but a criminal is bad to me. And the signs that I mentioned had evil/criminal people. x

People are neither inherently good nor bad. We have a bit of both in us, and we are ultimately judged in how we choose to act. A lack of maturity or self-awareness would make someone more likely to display negative traits, but we all have tendencies from time to time even if we come off smelling like roses.

With astrology, you should understand that there is far more to a person than just their Sun sign. Each and every person has a Sun, Moon, Mercury, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, and Rising sign. Additionally, each of these planets are placed in one of twelve houses which are also ruled by signs on the house cusp. There are also aspects between the planets which affect you depending on the degrees between each planet. When you consider all of these features with the inclusion of transits, and your own free will and upbringing, it is very hard to actually define someone by one sign. Astrology does work, but only if you study it very deeply and consider all of the information, not just the Sun sign. Professional astrologers have been studying for years to fully understand all of it.

Astral Alignments have nothing to do with personalities. Personality is the result of our own upbringings coupled with our own unique genetic codes. Not where Mars, the sun and Aquarious were the day we were born. Stars do not control our personalities or our destinies. They do keep the superstitious busy though (which may be a good thing for the scientifically minded)

"It seems that often, the good people in a zodiac sign do not even tend to possess many of the bad traits of their sign at all,"

Perhaps you could go even further and ask yourself what it is you can deduce from this information.

I would actually think there are 3 kinds of very signs according to decanates and the influence of neighbor signs

By the way, I think everybody has a nice and a dark side regardless their signs; showing their nice or dark side depends just on each individual

I agree with you about Virgo.

Cancer is so on point.