I realize that the company more than likely meant no harm to come from anyone. However, the designed and sold a product to the public. It was put out into the world to be put into people's homes. We trust companies to build and design products that we can use and be safe while using.
Children, unfortunately, die all the time for any number of reasons. It seems to me IKEA did not know of the problem beforehand and is willing to correct their mistake. It will not bring those children back, but you have to understand that these things happen. It's not like the floaty incident where over a hundred children died due to faulty floaties that the company knew about, but were to cheap to fix before shipping them out.
Ikea's dressers are not inherently any more dangerous than any other dressers . All dressers or potentially unstable furniture should be anchored to the wall to prevent toppling which could lead to injury or even death for children. It is very unfortunate that there have been some deaths associated with these dressers; Ikea is taking correct action by offering refunds or free anchoring kits to those with the affected furniture. I believe they have acted appropriately and should not be criminally charged.
No, the company should not be held criminally liable for the deaths of the six children unless the design flaw suggests that this was a strong possibility. If only six children died out of millions of users of IKEA's chests and dressers, this means that the design may be safe for normal use. These children may have done something harmful with the product.
A company should only be held criminally liable if they are aware of the danger beforehand and if they make no effort to reconcile damages after a problem is found. Ikea recalled millions of items in response to six accidents. This is an appropriate enough response if they knew nothing of the danger. It would also be nice if they offered compensation to the families but it should not be required of them.