It's true that seeing Liverpool's inconsistent performance in the Premier League doesn't seem surprising if Liverpool perform poorly in
the Champions League. But Liverpool should not lose by a big score, this is very embarrassing for Liverpool, who were runners-up in
the Champions League the previous season.
You are right. Even if Liverpool got defeated, at least it is not with 3 goals difference. It is a quite shame, Liverpool performance seems like a small team. Everyone must be disappointed with Liverpool since they are always a candidate for UCL winner in the last few seasons. the Champions League. But Liverpool should not lose by a big score, this is very embarrassing for Liverpool, who were runners-up in
the Champions League the previous season.
If it was chelsea ... they might sack klopp right in the morning lol.
Correct. Klopp is lucky that he isn't a Chelsea coach. 
So far at the early season ... liverpool didn't perform really well despite all the key players are available , the fans now looking something to blame and mane departure become one of many strong reasons.
I think it is not only about the Mane factor. But the whole Liverpool players are decreasing in motivation to play consistently and improve their performance. In some matches, I assume Liverpool players are getting lazy, they didn't play aggressively anymore. Klopp should evaluate the players' behavior/mentality.Liverpool fans and management know how much Klopp has done for Liverpool. He won them their first premier league title after 20+ years and won them the champions league aswell. So it would be really bad to sack him for starting the season bad.