For Li Xingkui, Li Fangping was not a major threat but definitely an unstable factor. If he had any tricks up his sleeve, it would be disadvantageous to Li Xingkui.
At this point, if you're not a friend, then you're an enemy, and since Li Fangping was clearly not Li Xingkui's friend, he could only be considered an enemy!
If Li Fangping was distributing benefits to the villagers to win votes on the surface but had other schemes in secret, it would be too late once the truth came to light.
So, Li Xingkui decided to strike first and nip Li Fangping's plans in the bud!
At that moment, Li Xingkui could even envision Li Fangping's disappointed face!
Breaking trust with the villagers, no matter the reason, would diminish his credibility in their eyes.
Especially since Li Fangping had just started to build some goodwill among the villagers, a sentiment that was not stable, and was likely to be largely lost due to today's incident.