Of course, if it were rigged, it would be a disadvantage to us bettors. All our attempts of researching would become pointless. But the good news is that it's not rigged. 
And my vote went for NO.
It would be if we are following what the public think, if games are rigged, that should be in favor against the public as public bets are bigger, or we can expect that it's the favorites that will lose if games are rigged. There's a lot of ways of rigging games, it could be in the straight up result, point spread, and even in total. And my vote went for NO.Since the 2007 NBA betting scandal there were no serious accusations against the NBA, and even that case didn't imply the games were rigged.
I still see some of the conspiracy theories in youtube videos, but it remained that way
The conspiracy theories sometimes fun to read/watch about, but I can't seriously consider them when there are no real proofs. In my opinion, there's too much money involved, hundreds of millions USD, in advertising during NBA games to risk losing it by trying to rig the games.