Shaikh Saaleh As-Suhaymi (may Allaah preserve him) said:

The great affairs of corruption that results from it (demonstrations/protests): The evilest of them are free mixing of (the opposite sexes) due to overcrowding, which leads to violating the honour (of others); also destruction and demolition (of property), and loss of both private and public property.

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[Source: القُطُوفُ الدَّوانِيُّ فِي سَرْحِ نُونِيَّة الْقَحْطَانِيِّ – page333]