This question is a really interesting cultural Rorschach test.
On this side of the pond, if it rains on the auto race or the baseball game and it's more than halfway done, the officials can call it completed if they wish. (If the home baseball team is winning at the time, that's game over.) I think that a PGA stop did go to 54 holes once due to rain. We have shortened seasons due to labor issues all the time. You get asterisks for juicing, not for winning a strike-shortened season or a rain-shortened game.
Your sports are different. You drive at high speeds in the rain on different tyres rather than stop the race. If the cricket match doesn't get finished, you come back the next day. You have fixture calendars and, other than conflicts between competition calendars, you darned well keep to the schedule unless a war breaks out. You don't let the players strike or collectively bargain.
Liverpool winning the title if the rest of the season were cancelled wouldn't even be a question to us...but then again, we'd make them enter a 16-team single-elimination playoff to win the title in any given year and they'd probably lose the title that way. The Pats memorably lost a Super Bowl that way a dozen years ago or so.