True to their motto, the Boys Scouts tried to be prepared. For months, they braced for the backlash sure to follow the court-ordered release of voluminous confidential files detailing decades of alleged sex abuse by Scout leaders.

Now the files are public, lawyers are calling for a congressional investigation and the Boy Scouts of America — as so often in recent years — finds itself embattled.

The files released last week are old — dating from 1959 to 1985. Many of the alleged abusers listed in the files may well be dead. And the Scouts, while apologizing for past mistakes, have significantly improved their youth protection program in recent years.

Still, release of 14,500 pages on alleged abusers is an unwelcome development for an organization struggling to halt a decades-long membership drop while incurring relentless criticism for its policy of excluding gays.

“It does pose a challenge for the Scouts, whether they’re going to be able to win back the confidence of the public,” said David Finkelhor, director of the Crimes Against Children Research Center at the University of New Hampshire.

In advance of the files’ release, the Scouts commissioned an internal review by a University of Virginia psychiatrist, Dr. Janet Warren, who tallied more than 1,600 abuse victims in her review of the confidential records. She described the rate of abuse with the Scouts as “very low” compared to the national rate, and suggested boys were safer in the Scouts than elsewhere in their communities.

Since the files were released — the consequence of a successful $20 million lawsuit against the Scouts in Portland, Ore. — the BSA has apologized for not following up on some of the allegations that were documented. It also has stressed the strides made to improve its youth protection policy.

Among other measures, the Scouts now prohibit one-on-one adult-youth activities, mandate criminal background checks for all staff who work with youth and include an insert for parents about child protection in the handbook issued to new scouts.

All adult volunteers must take child-protection training and also are directed to report suspected child abuse to law enforcement authorities.

However, the Scouts say they don’t have data to document trends regarding abuse within their ranks, a source of frustration to experts who’d like to track the impact of the new policies. The two lead lawyers in the Portland lawsuit — Kelly Clark and Paul Mones — note that the Scouts are a congressionally chartered organization and are now asking Congress to investigate the effectiveness of the child protection program.

Wayne Perry, the Scouts’ national president, said he’d welcome any inquiry.

The Scouts still have legions of staunchly loyal supporters, including several of the nation’s major conservative religious denominations who have given no sign of disaffection. The Mormons’ Church of Jesus Christ of Latter-day Saints charters more than 37,000 Scout troops with a youth membership of more than 420,000; Roman Catholic parishes charter about 8,500 units with about 283,000 members.