How can these people be so bad?

***** Hand History for Game 4734258896 *****
$25 NL Texas Hold'em - Saturday, July 15, 14:39:13 ET 2006
Table Table 108154 (Real Money)
Seat 4 is the button
Total number of players : 6
Seat 1: mikeelikeit1 ( $28.05 )
Seat 2: rhino200601 ( $40.85 )
Seat 3: nuh_uh_III ( $46.61 )
Seat 4: KFargoyle ( $25.85 )
Seat 5: Kaz27 ( $8.89 )
Seat 6: grandma772 ( $25.25 )
Kaz27 posts small blind [$0.10].
grandma772 posts big blind [$0.25].
** Dealing down cards **
Dealt to grandma772 [ ]
mikeelikeit1 calls [$0.25].
rhino200601 calls [$0.25].
>You have options at Table 108040 Table!.
KFargoyle folds.
Kaz27 calls [$0.15].
grandma772 checks.
** Dealing Flop ** [ , , :Ac: ]
Kaz27 checks.
grandma772 checks.
mikeelikeit1 checks.
>You have options at Table 107943 Table!.
rhino200601 checks.
** Dealing Turn ** [ ]
Kaz27 checks.
grandma772 bets [$0.50].
mikeelikeit1 folds.
rhino200601 calls [$0.50].
Kaz27 folds.
** Dealing River ** [ :Th: ]
grandma772 bets [$1].
rhino200601 calls [$1].
>You have options at Table 108040 Table!.
grandma772 shows [ 8c, 2c ] a flush, ace high.
rhino200601 shows [ Tc, Kc ] a flush, ace high.
rhino200601 wins $3.80 from the main pot with a flush, ace high with king kicker.