Except for the fact they all burned within the same 24 hour period, were all Orthodox churches, Macedonian, Serbian, and Greek, (which is an interesting mix to me, at least). Wonder if those three have something more than being Orthodox in common in that geographic area at the moment ? Outspoken Patriarchs for example ?
Why don't the authorities just tell the truth and say they don't care enough to investigate and see if there's something linking the fires to one another ?
Because they don't know how?
In this case, there may be an answer which they don't want the public to discuss.