No it's not. Liquidating material is simply a strategy like any other.
Is it bad sportsmanship to sacrifice exchanges to ensure a winning end game?

Simplification in an advantegous position is a good tactical motif.
I don't see why good tactics would make bad sportsmanship.
Is it bad sportsmanship to sacrifice exchanges to ensure a winning end game?
So if I'm already winning but cant see a direct mate, but if I exchange and sacrifice all pieces im left with an unbeatable pawn advantage with an easy win, is this considered bad sportsmanship?