Without absolute knowledge of a man's ability to operate within the parameters his position as a leader permits, I think it is quite unfair to pass judgement upon his intelligence.
As President, Mr Christofias is subject to a degree of criticism regardless of whatever decisions he might make (OR attempt to make) since his very position is ever under close scrutiny.
That which may appear to be 'Idiocy' to those who oppose him, will be regarded as 'Intelligence' by those who do not, therefore, as has become abundantly clear in the realm of politics (particularly in the arena which currently negotiates the Cypriot question) it is only when acceptable solutions (or compromises) are either found or agreed upon, that one should decide upon the acumen of the president.
If one wishes to condemn the actions (or lack of them) applicable to the 'Explosion', then I think it might be worth considering what the general consensus of opinion might be had 40,000 Turkish troops been blown up as a result of it, no doubt Mr Christofias would be vilified by the Turks far more vociferously. (imho).