So here's my two cents about this, I'll use my analytical skills to uncover the truth (I kid, this is only my opinion):
Let's start from the Fire signs.
Aries:
Aries, from my experience, are not as impulsive as they are portrayed to be. Their rage is loud and explosive, but they forgive quite easily and they're not people that keep a grudge. Their capital vice would be wrath but they're not the most dangerous sign.
Leo:
Leo are too involved in their lives to be the most dangerous sign. They can be quite narcissistic and tactless when dealing with others, but they are not ones to put all their effort to ruin someone. They prefer to focus on themselves and outshine their enemies.
Sagittarius:
Most Sagittarius I know are quite unable to even get mad. They usually try to put themselves in other people shoes, maybe even more than Aquarius people. If they can't forgive you, they might be able to forget you. Too easygoing to be dangerous.
Earth Signs
Taurus:
Taurus can be quite stubborn, they surely remember all the wrongs people do to them and they are not quick to forgive. That being said, they seem the ones to believe in something like karma, and that time will heal any wounds anyway. They can be quite dangerous when pushed to their limits, but they are not in the first place.
Capricorn:
Now this is a powerful sign, maybe the most powerful. All that ambition combined with determination and stamina can create the perfect villain. Too bad (well, that's lucky for us) Capricorn seems to not consider spending their time for their enemies, which they perceive to be a span below them most of the times.
Virgo:
This is my sun, mercury and venus sign so I hope I don't come off as too biased. Virgo can be quite mean, in a bitchy kind of way. Victims are not spared from sarcastic comments and quite hurtful remarks. That being said, a Virgo will usually cut any tie that connets her/him to her/his enemies. Not that dangerous, but don't underestimate them.
Air signs
Aquarius:
Are we even discussing about them? They're devil advocates but would never hurt anyone. Even when they're not that good or evolved, they are just too able to see the reasons why they shouldn't act on their rage guided thoughts.
Gemini:
Even if their moral compass is twisted, they might be too busy dealing with the troubles they caused themselves to be angry and act accordingly. Not dangerous.
Libra:
Now this one is difficult. From my experience, it's a bit complicated to make them angry, but their rage can surprisingly be quite as explosive as the Aries one. Quick to forget anyway.
Water Signs
Pisces:
Sneaky and deceptive, they can be manipulative but not cold. Most of the time, they're just too self-destructive to be dangerous. It's just like they get angry with themselves in the first place, they're able to hurt you by making you feel guilty.
Scorpio:
I know what you're thinking, here we are, talking about the most dangerous sign. Well, not today. Scorpio are surely manipulative, cold blooded, vengeful but they have this very sensitive side which most of the times doesn't get enough recognition. They may reconsider their actions and don't get their revenge even when they accurately planned it.
CANCER:Now, this is the most dangerous sign. The major problem with them is that you don't even see it comin'. It's not that they keep a low profile, they're usually sincere sweethearts, but it's so easy to hurt them, so easy to make them feel abandoned or taken for granted. And they just can't tolerate that. And the closer you're to them, the more you should be afraid if you've hurt them. They start by being passive-aggressive as a warning, then become mostly manipulative, and if you do something quite hurtful like cheating on them, there's nothing that stops their rage (after they're done crying 😬). They are passion killers, and passion never forgives. Afterall, they're the most dangerous sign in the FBI lists for a reason.

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Zodiac Signs
EspiritualAll about Zodiac Signs from funny situations to Facts. Not all of these are mine.