Let's say the premise in the original post is true. Let's examine a constituency that elected a Labour MP in the last general election. I used Aldershot because they're the first one alphabetically which swung Con > Lab.
Labour won 40.7 % of the vote in 2024, which was an 18.6% gain for them over the 2019 election. Conservatives came in second at 29% (a decline of 27.8%) and Reform third with 16.9%, which was pure gain as they did not stand in 2019. (Note that had all of the Reform votes gone to the Conservatives, the then-incumbent Leo Docherty (Con) would have held the seat.)
Labour received 19,764 votes with a turnout of 61.8%, a decline of 5.7% since 2019. (In the absence of contradictory evidence, we have to assume that the other 38.2% of Aldershot's 78,569 registered voters - 30,013 people - chose not to vote. That's their right.) Your hypothesis suggests that at least 31,987 adults in the constituency ( < 40.7% of the electorate) are currently receiving government benefits.
You, OP, claim that Labour, and by extension Aldershot's MP Alex Baker, protect benefits BECAUSE such a high number of their constituents use benefits. If this is the case, is it not both logical and ethical for the MP - whoever it is, and whatever party - to support the benefits that their constituents depend on? What do you suppose would happen to the UK as a whole if these benefits were suddenly stripped, USA-Trump 2024-style? If there is a way to remove or reduce the benefits and support these constituents in another way, how is Labour uniquely awful for not doing so in their 26 months in office when the Conservatives failed to do so for 170 months? Or, if you believe that there has been a dramatic rise in successful benefits claims in Aldershot during the 2010 - 2024 period, how does that support your theory that recent Conservative governments have been dramatically superior to Labour?