JFK and friends

[L'lanmal]

JFK. A lord I found tasteless
. . . -sfyrur jfk hjak up ok ofpike.
JFK: ADD < HALF LOGS
RBH BH WHH JQA JAG

[Endymion]

So what we seem to have here is the first six digits of Pi and another six which appear after about 300,000 digits.
The bottom row are the initials of US presidents:-
19 Rutherford B Hayes
23 Benjamin Harrison
9 William Henry Harrison
6 John Quincy Adams
20 James A Garfield

Anyone care to add?

[L'lanmal]

The final answer is a single word, not necessarily thematic.

[Oscar]

I'll add the obvious to Endymion's observations:[ the letters generated by the number of each president yields 'Swift'.]

However the 3rd line suggests nothing to me and I presume the 2nd line is merely a continuation of the line 1 mnemonic transformed to give another 'JFK'?

[edit] The 3rd line utilises the first eleven keys of the middle line of a keyboard plus "<" and "O", which seems suspicious.[/edit]
[2nd edit]Oh I see - it forms an arrow pointing at the "@" sign which is of course "at" so the pointee might be the following tilde.
However neither 'piat swift' nor 'pitilde swift' mean anything that I can find.[/2nd edit]

[L'lanmal]

On the right track. Two things:
1. The second line is not (just) representing an extension of the pi mnemonic. Though it does not upset me that it does.
2. I have an American keyboard.

Edit: Ok, 3 things. This is clearly a theme and variations on http://www.mit.edu/~puzzle/12/puzzles/ogre_of_la_mancha/jfk_shags_a_sad_slim_lass/

[Oscar]

OK so the arrow is pointing towards the quotemarks, giving:

pi ? quotes Swift

The 2nd line doesn't caesar shift to anything meaningful and it's not in some foreign language.
Presumably we're looking for a quote from, or somebody quoting, Jonathan Swift?

[Oscar]

I originally assumed the 2nd line began with an ellipsis and took no notice of the dash or minus sign that followed but I suppose it could be Morse code giving many different interpretations such as 'V', 'ST', 'EU' etc, none of which look promising. I might try treating the 4th character as a 'minus' and see where that gets me...

[L'lanmal]

A typo in the first word (now fixed) probably wasn't helping matters.

I probably should have just used a Caesar shift, but it would have been impossible to involve a JFK in that line then.

The fifth letter was a cyphertext 'o', which represents b. I have corrected it to a cyphertext 'u', which represents t.

[Oscar]

Ah! I believe the missing word is promises

Using a plausible series of substitutions for the second line produces:
'crusts are made to be broken'
and the quote from Jonathan Swift is:
'Promises and pie crusts are made to be broken'

Nice!

[L'lanmal]

You are correct.

The cryptogram for line 2 did seem kind of like a kluge, as it is the only line not cluing a single word and was not of suitable length to easily be decrypted independently.

But this was all about things you can do to put information into (and get information out of) seemingly gibberish phrases, and cryptograms definitely fit the bill.