The England and Wales Cricket Broad (ECB) announced the end of Pietersen's association with England earlier this week, citing a need for a new "team ethic and philosophy" after the 5-0 Test series defeat in Australia.
However, Flintoff feels that it is wrong to single out individuals and has questioned the team spirit within the England squad.
"The group doesn't seem to be a group any more," he told British newspaper the Daily Mail. "They've got one player who can take the blame and the rest of them want to go about their business and let him take the fall.
"I'd have more respect for some of the senior players if they held their hands up, rather than letting it all get heaped on one bloke."
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"If his attitude was that bad, why did he play five Tests?" Flintoff said.
"Who made the decision to drop him? Do they genuinely believe we are better off without him, or are they just fearful for their own jobs and too afraid to say no?