Planets and Aggressive Tendencies

At the top of the countdown - Mars & Sun, comes first, because of their fiery temperaments and they gives aggressiveness or impulsive actions.

If Mars and Mercury conjoins then native got anger but, may turn cool after some time because, Mercury bring intelligence which helps the native to get control over the anger.
Mars+Saturn, this association between fire and the cool windy temperament of Saturn makes native aggressive towards the goals,
The dangerous form of aggression is found those having afflicted Moon and Mars in their natal charts.

The blemished Moon by Saturn, Rahu, Ketu or positioning of Moon in the 8th house can results dangerous outcome of aggression.
As per my practical experience, oftentimes found native committed suicide or harmed someone, due to these combinations which leads to the high intensity of aggressive tendency.

I hope this answer help you to understand the cause of mental issues aggression and it's various aspects.

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Thanks
Astrologer Subhash Sharma