It is easy to blame Clinton, if one does not agree with repeal of the section of the Glass-Steagall by the Financial Services Act, but a majority of Congressmen were in favor of the new Act.
A veto by President Clinton could not have overridden Congress.

Senate
90-8; Republicans 52-1, Democrats 38-7, in favor.

House
343-86; Republicans 205-16 Democrats 138-69, in favor.
House Democrats favored the new Act 2-1)

Figures from Wikipedia.