It seems problem is yours. This seem perfectly normal for air for in operation.. non-combat loss, typical 20-40%
Trouble is, the Luftwaffe hardly ever operated under normal conditions. Even when they were enjoying their best victories, over France and Poland, they suffered a heavier than "normal". Over Poland, they suffered 285 combat losses and a further 220 to noncombat reasons. Often forced to operate from rough forward strips the attrition rate is particulalry noteworthy. Over France the LW suffered an attrition rate (combat and noncombat) of over 36%.
The losses to noncombat reasons in Russia. Though some aircraft were just rendered unserviceable, by the end of July '41, the German operational strength had fgalen to about 30% of its strength at the beginning of the camapign. Thereafter the best month for operational runners was June 1942, when 4 air fleet achieved an operational readiness rate of 72%. According to Hayworth, German losses to non-combat courses ran at between 40 and 45% per month. Some of these might be repairable, some mighht not, but small wonder that by 1945, there were only 1500 aircraft available on the front. This is after over 100000 aircraft had been produced.
As the bombing offensive warmed up, the accident rate over Germany also increased. It makes sense that pilots with limited ezxperience, called upon to operate in conditions of extreme stress are going to suffer a high attr4ition rate. At the beginning of 1944, over Germany it was about 30% of the force structure per month. By the end of the year, this had increased to 45%. For Night Fighters and the Wild Sau aircraft, the loss rates exceeded 50% per month.
It is not valid to try and compare the allied loss rates to those suffeered by Germany. At least not the western allies. They were never subjected to the same stresses as the Luftwaffe, had some inbuilt advantages (like stell matting for rough strips) and all round, never pushed their air forces to the same extent as the Axis
I think I saw data for Bf 109 accident rate for landing accidents. Not very high - 1-2% of all loss I recall my memory. Of course all planes had accidents. Fw 190 had wide landing gear - think it never ground looped..? I do not.
Well, over France in April 1941, the losses due to landing/TO accidents as a proportion of the total losses were about 40%. These were the best pilots in Germany at the time. Does not tally up to your claim......