If you've bought the game then of course, just torrent it and play it that way. Totally fine imo.
But I hate it when people think they're suddenly entitled to pirate it (without buying), if you don't support the game then just let it go.
I'm not gonna defend always online DRM though, it's pretty stupid but from what I've read it's just the way the whole social aspect of the game is designed, and you can't get around the servers for that (+ some of the simulation is server side apparently?). A bit of a dodgy design choice but with their focus on the mainstream market I can see why they chose to do it.