All of us, citizens/voters must find out all we can about all the candidates contesting from our constituencies. We must make sincere attempts to choose a candidate that we think would be best out of those on offer.
If, after all that effort, we come to the conclusion that none of the candidates fulfill what we are looking for in our elected representative, it is only then that we should press the NOTA button.
While making the most important decision as citizens of the country, we must not vote for candidates who have self-declared criminal cases pending against them.