Pretending that people aren't being disenfranchised from voting as a coordinated campaign in the US is to have blinkers on. It has a long and storied history that hasn't ended[1]
[1] https://en.wikipedia.org/wiki/Voter_suppression_in_the_Unite...
But is there some reason to think that it would tend to improve the decision making quality of the population? That when compulsary voters are included, there would be better choices made on laws and representatives? I can't think of one. On the contrary it would seem to compel the participation of a lot more people who don't care.