At some busy stations (e.g. Canary Wharf during the morning rush hour) you'll find a big cluster of people at the bottom waiting for the standing side while there's space on the walking side. Obv. it gets dangerous if a trainload of people can't leave the station before the next trainload arrives. (Or more cynically, if they can achieve the same throughput with fewer escalators they'll save money on escalators).

Yeah, but it's only dangerous because those people choose to stand there waiting instead of using their legs. It's their choice to be lazy and those create a danger for everyone else. We need to stop rewarding people who can't do anything for themselves.

True laziness would be not building more escalators were they're needed. Basic safety isn't "rewarding" people.