Absolutely, the govt has been pumping weapons into Mexico for years under the failed "War On Drugs" banner, now they want to increase the "help" to Mexico in battling the cartels again... By sending more weapons.
Anyone with half a brain can tell that Mexico is hiding the true source of the weapons traffic by not releasing the serial numbers from the confiscated weapons... Because the bulk of American made weapons come from the Mexican Military deserters and the Zetas, which were supplied by... Good 'ole Uncle Sam.
Drop the WOD and the Cartels influence and funds would be cut to the bone.
Unfortunately I think the current administration (and possibly the last two as well) have a stake in wanting to foment civil strife in Mexico in order to break the border with a flood of refugees.