This actually makes a lot of sense for them.

They are dealing primarily with things like dope dealers and insurgents, and purchase of 12 Mi-35M attack helicopters gets them an aircraft that is competent in attack, but also has the ability to carry 8 troops or a 4 of litters in a medevac situation, and so are more flexible.

They are also likely a lot cheaper, than the competition, the Eurocopter Tiger, and the Agusta-Westland Mangusta.