Answer:I'm going to assume you haven't watched the entire movie. There is a scene in the movie when all minions abandon Gru due to Gru not being willing to return to his prior lifestyle of being evil and committing crimes.
Plot hole: Bratt's bubble gum is strong enough to withstand projectiles like bullets, lasers, and even strong enough to carry a tanker into the sky but can't withstand Gru's body weight when he crashes into it before "happy birthday Dan".
Answer: I'm going to assume you haven't watched the entire movie. There is a scene in the movie when all minions abandon Gru due to Gru not being willing to return to his prior lifestyle of being evil and committing crimes.
Rassdyt