You may not but the fact is that Pak military is like a caterpillar - many of the legs it runs on are US provided and powered. Say if $450 million is kept back because of non certification which is almost certain, Pak military will still get $450 million.
I do not have the exact figure for Pak military budget but if it is say $4.5 billion then that is still 10% and no mean figure to be scoffed at. Inn the past it has been higher and in some years might have been 25% of the annual budget. That is lot of good money on top of the Pak defence allocation which goes on to add 'meat' to the army.
You also have many purchases like F-16s etc which again have been purchased by using defence aid. Bottom line it is easy dismissing it but when your dealing with hard facts - that every military runs on finances and Pakistan has a chronic culture of tax avoidance which means central budget is always not enough to run things let alone have enough to develop the country or even but capital equipment for the military.
In this scenario having or nursing pet hates is not a option. That is why every Pak leader including Gen. Raheel Sharif could simply have said no to the aid - it's not like that it is forced on them. But they had no option but to take it. For sake of argument say if US released the extra $450 million. What would it mean? Well for a starters the entire Frontier Corp could be improved with that money which would have significant positive effects.
Whether you like it or not but the sobering fact is most of what you see in Pakistan has been built up by US finances or is the legacy of British Raj. Precious little has been built up on local resources. We can blame the leadership or the local culture of not paying taxes but that is how it is.
And finally don't forget US is responsible to it's people and pursues it's own policy goals - nothing wrong with that. That is how it is. Pakistan has to look to making it's ruling elite including the military accountable for any failures. A prime and recent example is Musharaf. He was the creator of the Kargil debacle and then once in power on dubious grounds he gave away Afghanistan to the Northern Alliance the fruits of which Pakistan is still enjoying with daily anti-Pak rhetoric from that country. Not surprising since the very faction that hated Pakistan was installed in Kabul under his watch.
Yet today you have people still lauding his achievements including the economy - which only improved because of boost of extra American aid post 9/11.
That is not a choice Pakistan has as long as nobody pays taxes.
If wishes could be fishes. Trading preferances are mostly given to strategic partners not countries with limited shared values or interests. Pakistan has transient shared interests with US. Ayub Khan asked for this back in 1960s but failed to get it. He probablly came closer than any other leader in Pakistan's history in getting open trade agreement but even he failed.
His desperate appeal made in powerful language for a 'economic market' minus the politics failed to recieve support. The sad fact is economics and politics are linked. The West agreed to give Spain, Greece, even Japan the economic agrrements but that was because those countries also became political, social, civilizational juniors of the Western order.