There is something seriously wrong with our military that makes desk bound paper pushing officers rich, while the infantryman who lost both legs is left with little to show for his service. If it were up to me, I'd REDUCE the retirement benefits from those who "stick around" for 20 years and massively increase the benefits for the guys who get wounded actually fighting.
Let me start by saying I agree with a lot of your opinions on the military. Then let me say you are wrong and hopefully not intentially misleading regarding the infantryman who lost both legs getting less than the retired Col Lard Butt (unless he is also getting some disability pay).
Here is my understanding of the scenario you describe:
Infantryman lost both legs in war and is therefore eligible for combat-related special compensation disabilities (qualifications found here:
http://www.afpc.af.mil/library/factsheets/factsheet.asp?id=9622).
Infantryman elects to separate from the military (if they want to stay on active duty they have that option as there is a special clause allowing war wounded to stay on active duty).
Infantryman is rated 100% disabled (schedule of ratings here:
http://www.benefits.va.gov/warms/docs/regs/38CFR/BOOKC/PART4/S4_71a_table_2.doc)
Here's how I calculate the monthly pay for the infantryman:
Worst case scenario they were only in for 2 years and medically retired as an E3: Military retirement pay ends up being nothing because the VA payment is greater.
VA payment of $2,906.83 (assuming no dependents
http://www.benefits.va.gov/COMPENSATION/resources_comp01.asp#BM03)
Some sort of small combat-related special compensation estimate $100
Because they lost both legs they are also entitled to Special Monthly Compensation of $3,617.02 (Using code L below the knee and can use prosthesis
http://www.benefits.va.gov/warms/docs/regs/38CFR/BOOKC/PART4/S4_71a.doc)
There is also going to be a Traumatic Service Group Life Insurance payment between 25k and 100k
In addition there are multiple VA grants the veteran will be entitled to 14k for ramps 50k for home construction as two examples.
There are also various charities that will provide support.
You mentioned Col Lardbutt is probably getting paid to do consulting work (nevermind the required skills/qualifications to do that work). There are many double amputees that could potentially have significant additional income. Look up the fees of some motivational speakers or salaries for individuals who are successful fundraisers (or even Congresswoman Duckworth mentioned below - who also stayed in the military after her injuries).
As I calculate it the infantryman is paid $6623.85 tax free dollars in addition to the multiple one time payments. If they had more years of service the payments would obviously go up. That means they are paid over 75k per year tax free which likely means they are taking home more than Col Lard Butt is after taxes.
To Caliq who said the Congresswoman Tammy Duckworth is getting less than 100%, I believe you are mistaken. A double amputee is 100% disability as seen in the 5104-5011 ratings. You can find articles about her berating a vet who was awarded a 30% disability. Those articles mislead the reader to believe she gets very little by highlighting a comment where she discusses a single injury of hers that is rated at only 20% after multiple surgeries and she feels it should be more than the guys 30% for his foot.
All that being said is it enough for the double amputee? That's an individual question to be debated.
My second job in the military was working the disability evaluation system in the Washington DC area. I can tell you it was very emotional and political. Disability is a tough thing, especially in careers where there is increased wear and tear on the body. From my perspective trying to determine the cause of a breakdown can be very challenging, since age will result in breakdown anyway.
As mentioned some people are financially savvy some are not. Many of these infantrymen are not financially savvy. I saw individuals receive payments from non-profits or the TSGLI and buy BMW's and Benz's despite my (and others) recommendations not to. No amount of money is going to keep that type of individual from financial ruin. That is why there are so many stories of professional athletes and high level entertainers going bankrupt. Financial literacy isn't a given.
What I do know is both individuals (Col Lard Butt and Infantryman) should have understood the situations they were getting themselves into. Life is about choices and understanding the repercussions/consequences of those choices. Unfortunately many across all aspects of life are unable to comprehend repercussions/consequences.