Yes, it is a political question and my opinion to that is one word: bullshit.
If the Green party of Germany had approved the joint production for 1000 Leopard-2A6 tanks, than Turkey has now the first delivery and Germany had 7 billion at least receiving now just when Germany needed it. Yes, you should think twice were to sell your weapons and you must think 3 times where to buy your weapons that you can not eat crack from politicians. Turkey bought 375 leopard-1 series tanks in 1980-'84 and Turkey may not use them in conflicts? Are the weapons for show or something? Why Turkey pay for it, when we are in war (Germany vs. Turkey, it will never happen we know but just think if...) then Turkey would use German made Leopard-1's against Germany. Just saying using German pistols to execute German POW's. This is very painful when a Turkish foreign ministry spokesman told to the media in 1998 when Turkey started a big operation against the terrorist PKK in northern Iraq and the 'Greenery' party made big problems also effecting German economy. Shall Turkey ever buy weapons from Germany now? Turkey has now bought licenses to produce some vehicles, one example the Fennek. Now Turkey will produce self it's vehicles with German origin but Germany has lost in long terms only for one thing in a very dumb action. Germany can earn from Turkey ($ 7bln tank tender example) but Germany can not earn from terrorist.
And the tender in producing tanks under license, the US M1A2 abrams was also selected to the best tanks of the world. There are few best tanks in the world to mention: Leo-2A6, M1A2 SEP, Leclerc, T-84 and the Challenger 2. Challenger was the worstest of all 5 and then the leclerc, then T-84, The M1A2 SEP 2nd and Leo-2A6 the best. All had excellent scores but there is ony one the best choosen because of it's lower maintenance cost and quicker prepared for war: The Leo-2A6. The M1A2 SEP lost it because of it's Gas Turbine, slightly taked more time to be ready after operation and a bit more expensive in maintenance than the Leo-2A6. Overall, all 5 were good in warfare capabilities, mobility and reliability.
Also some rumors were in the US congress to not to sale the SEP version but only the M1A1 version like Egypt (also called the Abrams Lite in Turkish media when heard). Then Turkey has kicked out the US of it's list and only the T-84 and the Leo-2A6 was in the list. The T-84 is also a good tank and it is known of the T-80's succes. The T-84 has much more sophisticated computer systems than the original Russian T-80 and is more reliable too. Also it is cheaper and very robust for it's price/quality ratio. The Ukranians has confirmed to transfer technology and also to co-produce it for further customers. Why the US does not want to share tech is that the US will maintain it's exclusivitality, yes I understand but that time is over now.