U.S. District Court Judge Matthew Brann wrote in his order that Trump had asked the court to disenfranchise almost 7 million voters.

“One might expect that when seeking such a startling outcome, a plaintiff would come formidably armed with compelling legal arguments and factual proof of rampant corruption,” Brann wrote, so much that the court would have no option but to stop the certification even though it would impact so many people. “That has not happened."

https://apnews.com/article/election-2020-joe-biden-donald-trump-constitutions-pennsylvania-87eaf4df86d5f6ccc343c3385c9ba86c

In one of several Pennsylvania cases, Trump attorneys actually signed a legal document in which they stated,
“Petitioners do not allege, and there is no evidence of, any fraud in connection with the challenged ballots; Petitioners do not allege, and there is no evidence of, any misconduct in connection with the challenged ballots; Petitioners do not allege, and there is no evidence of, any impropriety in connection with the challenged ballots; Petitioners do not allege, and there is no evidence of, any undue influence committed with respect to the challenged ballots.”

Why did they do it?
As members of the bar association — the state entity that grants attorneys their license to practice law — lawyers have a professional ethics obligation “not to abuse legal procedure” by filing “frivolous” claims. Rule 3.1 of the Model Rules of Professional Conduct, some version of which applies in all states, forbids a lawyer from bringing a claim or argument “unless there is a basis in law and fact for doing so that is not frivolous.”

[...]lawyers must be able to honestly represent to the court that they have a basis for believing they have a path to getting relief either based on existing law or “a good faith argument for an extension, modification or reversal of existing law.”
Violating this requirement could expose the lawyer to sanctions from the state bar, which could range from a reprimand to a fine to a license suspension. More practically, it can erode courts’ confidence in the lawyer’s reliability and damage the lawyer’s professional reputation.
In Trump’s case, this means his attorneys can only say the election was stolen if they know of actual, credible reports of systematic fraud.

https://truthout.org/articles/trumps-election-fraud-claims-dont-appear-in-result-challenge-lawsuits/

"From a controversial international tour by the secretary of state, to shutting down emergency lending programs at the Fed as the pandemic accelerates, to continuing to do damage to the climate, Trump, with the consent of the GOP, is trying to sabotage Biden’s chances at a recovery every way he can. But it’s the nation itself that will suffer — and Trump and his administration don’t care. As Adam Serwer wrote in 2018 of Trump’s policies, “the cruelty is the point.” Trump is doing his best to accelerate it in his final weeks in office."

https://truthout.org/articles/trump-is-trying-to-set-yellen-and-biden-up-to-fail-as-he-sabotages-the-economy/