The nature of the planet definitely has an effect on the results obtained from the planet. Here, in case of Rahu being malefic, a negative element is visible due to its tamasic nature. In Vedic astrology, Rahu makes the person act according to the mindset, whenever we are affected by some aspect; it is natural that its effect will be strongly visible on us. Rahu puts the greatest effect on the intellect and mind. Rahu works to increase our desires, lust, dilemmas and confusions. Rahu represents smoke, in such a situation it is difficult to understand things well. This illusion trap of Rahu indicates more negativity to the native.