You can’t say there is no evidence of election fraud. The evidence in fact is accumulating and will be tested in formal proceedings, including courts of law.
Apart from that, evidence of election fraud is the wrong question to be asking. It is far more important to know whether the election was conducted fairly or in such a way as to produce a reliable result that voters can be confident of.
Outright fraud is only part of that more important question. For example, errors in the voter registration database can prevent valid voters from voting, or allow invalid voters to vote, neither of which may be an instance of fraud. Assuming procedures exist to minimize, catch or correct such errors, the question becomes: Were the procedures effective? If they were not effective, then the election did not produce a reliable result that voters can be confident of.
Those who say there is no evidence of election fraud are both simply wrong as a matter of fact, and missing the point.