why you think the London is bad or good

It depends on the level of play. Most people are not at the level where it becomes a bad opening.  I believe people don't like it because of the Fried Liver Attack. If you are starting to get beat, move to the Colle System.

I am not starting to get beat. I have been playing it for a year.

the fried liver attack only happens at the lower levels

if someone ever does it to me I just do d5 and when they take I attack their bishop

if they check I block

Introduction To The London System & Jobava London System...

https://www.chess.com/blog/RussBell/the-london-system

how's the london related to the fried liver?

wow you just said you hated it and it was trash

the fried liver is easily stopped with d5 once they take you can attack their bishop once they check you can block. you can analyze it

I'm gonna go out on a limb here and predict post 8 was sarcasm. Pattin myself on the back now. 

I think it's a good opening. Solid and healthy, limited amount of theory, decent attacking chances, some tricks & traps. Many players still underestimate it and are not well prepared against it.

It is a good opening to learn and hard to crack. I only hate the Englund gambit

solid, reliable, and white can tweak it be more aggressive if needed. It is one of those necessary evil's the black player must make peace with. 

It equalizes sooner than main stream Queen pawn games though and in one specific reply or two (some early qb6 replies and early e5 supported by g6 systems come to mind) black may very well be a feather bit better.

I used to think it's bad, but, it's good. for the following reason:

As GM Williams said, in his article:

https://www.chess.com/article/view/picking-the-correct-opening-repertoire

You need to have 3 openings: one against 1.e4, one against d4.

and one as White...

here's the problem... you can't have 'one opening with White' if you play e4 / d4 - center-control starting moves, unless, you play d4, with the London. ... you may play 1.c4, 1.f4, or b6, g6. ... but that's all flank openings, and they have their down side. - you give the opponent the center.

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one can play a Catalan as White, it fights against 4 openings - QGD, QID, Nimzo-Indian, and Semi-Slav. and for the rest, to find a defense for each option. - still, that's hard.

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So while not best objectively, in practical terms - the London System is the Best opening. - You play it with White against anything, and you don't play a flank / hyper-modern opening (I don't say they're bad, but they're harder to play. which means they're bad for humans - which means they're bad).

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of course, if you play only 1 opening, you'll be good at it. but if you play, say, 1.d4, and respond to each opening... hard, and... Black is Forcing an opening on you, you don't Want to play "a respond to an opening" you want to play an opening. the London is the best, I guess that's what I should play as well.

People have played this gambit against me. If instead of the main line, you just develop and 0-0, your game is amusingly easy, you play with his queen. take that pawn, strive to 0-0, you'll have a good time.

I think nikkilikechikki really means the fried liver is the best opening. I said it can be stopped easily. in another one she said she thought the London was trash just because players play it like. zombies but I do not be a zombie