Answer: to thwart a resurgent Opposition after the Bihar elections, and to avoid a repeat in UP. (1/4)
Indira Gandhi was disqualified by the Allahabad High Court for far less. (2/4)
Whether or not EVMs were hacked or replaced, there's plenty of prima facie evidence for calling this a stolen election. (3/4)
The election data analysis and commentary then pretend this is business as usual, and hence, legitimate.