Casperian, if you're going to balk at having Sheed because he might get hurt, then we better get rid of the big 3 ASAP - they're on the wrong side of 30 and they might get hurt!
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There's no way that should be considered a 'red flag', especially since you already addressed his age in your first point. At most, it should simply be included there.
Fair enough.
His style of play is really "low-impact", which is an advantage. Unfortunately, we´re talking about the NBA here, athletes at the highest level. There´s a big difference between the body, motor and desire of a 31-year-old and a 36-year-old, and between a professional like Ray Allen, for example, and someone like Rashweed Wallace.
The thing is, it sounds like you're just making up points to fit your argument. Rasheed hasn't been injured, for example, but somehow you wanna red flag him for something that MIGHT happen. KG's knee also MIGHT give out. Should we trade him? If you don't like Rasheed, fine, but when I say "being down on him", you make it ALMOST sound like you just want him to fail. You basically made two red flags out of the same exact thing (4 and 5). You made it look like you were biting more off than you could chew, and that always rubs me the wrong way. It doesn't matter if you're right, wrong, whatever, if you think you're right, you shouldn't feel the need to do that.
Same for saying "You're showing you don't trust someone already there.", even though in theory that person was already off the Celtics. If you're going to make points out of nothing, it's hard to take your stance seriously.
Oh and for the record, I hate half the trade proposals posted on this Blog. 
It wasn´t an internet-tactic, if that´s what you mean. I´ve simply made a long post because there are many little things wrong with this signing, imo. Many unanswered questions that people always ignore and that I do find pretty important.
As I said above, if you don´t think that health is an issue for a 36-year-old with a 3-year-contract, I don´t know what to say. We simply disagree. Minor injuries will start to catch up with anyone at that age.
"At some point over 30, guys don´t get healthy, they just get older".
That´s more or less what Charles Barkley said last year, and it´s absolutely on point here, imo. The regenerational power of an average 30-year-old and and average 36-year-old are not comparable.
But you know what, there´s a reason why this is only point #5, and it´s only one sentence, and that is because I´ve added it after finishing the actual post, which took me an hour. I´ve figured I didn´t emphasize on my concerns about health enough.
And there´s a reason why I didn´t put a "red flag" behind the last three points, because these points are certainly arguable and depend on your opinion. I wanted to make an even longer list, because, as I´ve said, there are too many questions unanswered for me with this signing, but I´ve figured one hour has to be enough.
The other points, however, are definitive reasons to be concerned, imo.
I just can´t buy this as a good move, and certainly not as the big deal other fans made it out to be.