3.75 on United which are losing by 2 goals at the moment? No thanks

I have prepared several multiple bets on the third round of the Premier League where I chose United to win over Burnley, but now I doubt whether I did the right thing.
It's been 70 minutes with no goals from Man United.
Who dares to take odds of 3.75? It's just a waste of money because we already know the result will definitely be a loss they have been playing poorly even though they have many expensive players.
I think I would think twice about betting on Man United against Burnley if the result is this uncertain.