I'll add Mowich why it was banned in the EU, and the most dangerous aspect of 'meat glue'.
Essentially, the reason a steak is safe to cook rare, is because the inside of the steak has never come into contact with bacteria in the air, on counters, etc. With the advent of 'meat glue', you could be eating rare, a steak that is comprised of dozens of small pieces, each of which have had microbial exposure. Thus, cooking it rare exposes you to the same risks as, essentially, eating hamburger raw. The health risks with undeclared 'glued' meat are phenomenal.