First-half goals from Juan Bernat and Neymar, who overtook Kaka as the highest-scoring Brazilian in the Champions League, were enough to secure victory for PSG and leave them with their destiny back in their own hands ahead of the trip to Red Star Belgrade.
Marco Verratti was injured for the previous meeting but he set about making his mark - quite literally at one point, with an ugly lunge on Joe Gomez which should have resulted in a red card - from the off.
"Tonight we looked like butchers when you look at how many yellow cards we had".
"For me it is a red card, yes, but then we have a story and it looks like I am a bad loser".
James Milner pulled one back for Liverpool from the penalty spot after Angel di Maria had fouled Sadio Mane, but Klopp's team could not find a second after the break with their forward line of Mane, Mohamed Salah and Roberto Firmino unusually ineffective.
"I don't know how they return home and talk to their families and wives".
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Some of the migrants are believed to have been participating in the protest on the Mexican side. "Children screamed and coughed". The migrants in that episode also reportedly threw rocks and bottles at US authorities.
PSG are a further point adrift of Napoli but will have home advantage against Liverpool FC on Wednesday night. "But I saw the penalty". It was not even a foul for him, unbelievable.
"But it's a tight game in a very important competition". I don't want to say Paris didn't deserve [to win], and I don't expect help from a referee, I just expect him to calm all these things down.
"When the game starts like that, it's quite hard to gain confidence always", he said.
"Obviously they're world-class players but I don't think it's needed in the game at times", added the Dutchman.
Questions have been asked of their ability to replicate the free-flowing football which made them so exciting last season, with Warnock of the opinion that key men are not firing - regardless of claims to the contrary.
Much has been made of PSG's theatrics during Wednesday's clash at the Parc des Princes, with Milner penalised by the referee on a number of occasions. Of course we can lose in Paris and that will happen to a lot of teams in the future. "The last campaign we were stronger through the group stage but we had to win in the last game and managed it, so it's the same this time".