The former Labour home secretary said it would turn the UK into a "pariah amongst western European states".
"Desperate people will continue to take life threatening journeys because they feel they have no choice," the SNP's Alison Thewliss told her.
A major search operation went ahead and four people have been reported dead.
Suella Braverman's predecessor dropped her in hot water over her management of asylum seekers.
The refugees said some of them are "very sick" and they feel like they're "in prison".
“The United Kingdom has a clear and a generous humane approach to asylum seekers and refugees."
Thousands of migrants are are being brutally rejected from the EU and forced to squat in woodlands instead.
Gheorghe Nica, 43, and Eamonn Harrison, 24, were also convicted them of their part in a wider people-smuggling operation.