the problem with pitting him earlier was that they that the tyres would not last and he would have to stop once again. During his second stint Leclerc was posting competitive lap times only for a few laps, that is the real issue here. Since he was more competitive with the yellows than he would have been with the reds it didn't make any sense to bring him in early.I don't think they sabotaged his race, that would be an idiotic and assinine suggestion. What they did do was to make the wrong decision on timing. I beleive they should have brought him in when he could still rejoin in front of Verstappen, pitting him later would only work if the tyres switched on and gave him a 1.5 second per lap advantage.
we might argue that they should have been able to set up that car properly (for both drivers) but that is a different matter, last Sunday what Ferrari did was damage limitation, they tried to hedge their bets with 2 different strategies knowing that they didn't have the speed to challege the Mercs and that was the right thing to do. In the end Vettel finished the race where he started it and Leclerc gained several positions notwithstanding the fact that on his second stint he simply didn't have the pace of the leaders (thanks to a very long stint on the compound that actually worked for the Ferrari), to me it looks as if for once Ferrari gave Leclerc a decent strategy and that he should be grateful.
Leclerc compromised his race by hitting the wall on Saturday, these things can happen but it's not Ferrari's fault